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Intermediate Algorithm Scripting (ex. 14 to 21)
+ Finished Intermediate Algorithm Scripting module
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‎09-intermediate-algorithm-scripting/14-smallest-common-multiple.js

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/*
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Smallest Common Multiple
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Find the smallest common multiple of the provided parameters that can be evenly divided by both, as well as by all
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sequential numbers in the range between these parameters.
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The range will be an array of two numbers that will not necessarily be in numerical order.
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For example, if given 1 and 3, find the smallest common multiple of both 1 and 3 that is also evenly divisible by
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all numbers between 1 and 3. The answer here would be 6.
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- smallestCommons([1, 5]) should return a number.
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- smallestCommons([1, 5]) should return 60. 1, 2, 3, 4, 5
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- smallestCommons([5, 1]) should return 60.
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- smallestCommons([2, 10]) should return 2520.
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- smallestCommons([1, 13]) should return 360360.
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- smallestCommons([23, 18]) should return 6056820.
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*/
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function smallestCommons(arr) {
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const [min, max] = arr.sort((a, b) => a - b);
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const numberDivisors = max - min + 1;
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let upperBound = 1;
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for (let i = min; i <= max; i++) {
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upperBound *= i;
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}
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for (let multiple = max; multiple <= upperBound; multiple += max) {
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let divisorCount = 0;
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for (let i = min; i <= max; i++) {
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if (multiple % i === 0) {
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divisorCount += 1;
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}
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}
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if (divisorCount === numberDivisors) {
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return multiple;
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}
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}
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}
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console.log(smallestCommons([1, 5]));
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console.log(smallestCommons([5, 1]));
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console.log(smallestCommons([2, 10]));
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console.log(smallestCommons([1, 13]));
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console.log(smallestCommons([23, 18]));

‎09-intermediate-algorithm-scripting/15-drop-it.js

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/*
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Drop it:
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Given the array arr, iterate through and remove each element starting from the first element (the 0 index) until the
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function func returns true when the iterated element is passed through it.
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Then return the rest of the array once the condition is satisfied, otherwise, arr should be returned as an empty array.
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- dropElements([1, 2, 3, 4], function(n) {return n >= 3;}) should return [3, 4].
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- dropElements([0, 1, 0, 1], function(n) {return n === 1;}) should return [1, 0, 1].
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- dropElements([1, 2, 3], function(n) {return n > 0;}) should return [1, 2, 3].
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- dropElements([1, 2, 3, 4], function(n) {return n > 5;}) should return [].
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- dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;}) should return [7, 4].
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- dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;}) should return [3, 9, 2].
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*/
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function dropElements(arr, func) {
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let finalArr = [...arr];
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for (const val of arr) {
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if (func(val)) {
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return finalArr;
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}
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finalArr.splice(0, 1);
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}
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return [];
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}
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console.log(dropElements([1, 2, 3], function (n) {
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return n < 3;
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}));
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console.log(dropElements([1, 2, 3, 4], function (n) {
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return n >= 3;
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}));
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console.log(dropElements([0, 1, 0, 1], function (n) {
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return n === 1;
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}));
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console.log(dropElements([1, 2, 3], function (n) {
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return n > 0;
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}));
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console.log(dropElements([1, 2, 3, 4], function (n) {
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return n > 5;
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}));
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console.log(dropElements([1, 2, 3, 7, 4], function (n) {
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return n > 3;
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}));
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console.log(dropElements([1, 2, 3, 9, 2], function (n) {
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return n > 2;
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}));

‎09-intermediate-algorithm-scripting/16-steamroller.js

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/*
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Steamroller:
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Flatten a nested array. You must account for varying levels of nesting.
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- steamrollArray([[["a"]], [["b"]]]) should return ["a", "b"].
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- steamrollArray([1, [2], [3, [[4]]]]) should return [1, 2, 3, 4].
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- steamrollArray([1, [], [3, [[4]]]]) should return [1, 3, 4].
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- steamrollArray([1, {}, [3, [[4]]]]) should return [1, {}, 3, 4].
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- Your solution should not use the Array.prototype.flat() or Array.prototype.flatMap() methods.
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*/
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function steamrollArray(arr) {
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let finalArr = [];
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arr.forEach(item =>
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Array.isArray(item)
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? finalArr.push(...steamrollArray(item))
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: finalArr.push(item));
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return finalArr;
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}
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console.log(steamrollArray([1, [2], [3, [[4]]]]));
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console.log(steamrollArray([[["a"]], [["b"]]]));
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console.log(steamrollArray([1, [], [3, [[4]]]]));
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console.log(steamrollArray([1, [], [3, [[4]]]]));
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console.log(steamrollArray([1, {}, [3, [[4]]]]));

‎09-intermediate-algorithm-scripting/17-binary-agents.js

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/*
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Binary Agents:
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Return an English translated sentence of the passed binary string.
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The binary string will be space separated.
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- binaryAgent("01000001 01110010 01100101 01101110 00100111 01110100 00100000 01100010 01101111 01101110 01100110 01101001 01110010 01100101 01110011 00100000 01100110 01110101 01101110 00100001 00111111") should return the string Aren't bonfires fun!?
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- binaryAgent("01001001 00100000 01101100 01101111 01110110 01100101 00100000 01000110 01110010 01100101 01100101 01000011 01101111 01100100 01100101 01000011 01100001 01101101 01110000 00100001") should return the string I love FreeCodeCamp!
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*/
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function binaryAgent(str) {
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return str.split(/\s+/)
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.map(binary => String.fromCharCode(parseInt(binary, 2)))
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.join("");
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}
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console.log(binaryAgent("01000001 01110010 01100101 01101110 00100111 01110100 00100000 01100010 01101111 01101110 01100110 01101001 01110010 01100101 01110011 00100000 01100110 01110101 01101110 00100001 00111111"));
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console.log(binaryAgent("01001001 00100000 01101100 01101111 01110110 01100101 00100000 01000110 01110010 01100101 01100101 01000011 01101111 01100100 01100101 01000011 01100001 01101101 01110000 00100001"));

‎09-intermediate-algorithm-scripting/18-everything-be-true.js

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/*
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Everything Be True:
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Check if the predicate (second argument) is truthy on all elements of a collection (first argument).
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In other words, you are given an array collection of objects.
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The predicate pre will be an object property and you need to return true if its value is truthy. Otherwise, return false.
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In JavaScript, truthy values are values that translate to true when evaluated in a Boolean context.
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Remember, you can access object properties through either dot notation or [] notation.
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- truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex") should return true.
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- truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex") should return false.
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- truthCheck([{"user": "Tinky-Winky", "sex": "male", "age": 0}, {"user": "Dipsy", "sex": "male", "age": 3}, {"user": "Laa-Laa", "sex": "female", "age": 5}, {"user": "Po", "sex": "female", "age": 4}], "age") should return false.
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- truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true}, {"name": "FastForward", "onBoat": null}], "onBoat") should return false.
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- truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true, "alias": "Repete"}, {"name": "FastForward", "onBoat": true}], "onBoat") should return true.
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- truthCheck([{"single": "yes"}], "single") should return true.
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- truthCheck([{"single": ""}, {"single": "double"}], "single") should return false.
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- truthCheck([{"single": "double"}, {"single": undefined}], "single") should return false.
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- truthCheck([{"single": "double"}, {"single": NaN}], "single") should return false.
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*/
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function truthCheck(collection, pre) {
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for (let obj of collection) {
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if (!Boolean(obj[pre])) {
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return false;
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}
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}
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return true;
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}
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console.log(truthCheck([
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{"user": "Tinky-Winky", "sex": "male"},
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{"user": "Dipsy", "sex": "male"},
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{"user": "Laa-Laa", "sex": "female"},
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{"user": "Po", "sex": "female"}]
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, "sex"));
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console.log(truthCheck([
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{"user": "Tinky-Winky", "sex": "male"},
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{"user": "Dipsy"},
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{"user": "Laa-Laa", "sex": "female"},
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{"user": "Po", "sex": "female"}]
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, "sex"));
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console.log(truthCheck([
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{"user": "Tinky-Winky", "sex": "male", "age": 0},
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{"user": "Dipsy", "sex": "male", "age": 3},
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{"user": "Laa-Laa", "sex": "female", "age": 5},
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{"user": "Po", "sex": "female", "age": 4}]
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, "age"));
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console.log(truthCheck([
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{"name": "Pete", "onBoat": true},
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{"name": "Repeat", "onBoat": true},
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{"name": "FastForward", "onBoat": null}]
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, "onBoat"));
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console.log(truthCheck([
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{"name": "Pete", "onBoat": true},
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{"name": "Repeat", "onBoat": true, "alias": "Repete"},
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{"name": "FastForward", "onBoat": true}]
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, "onBoat"));
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console.log(truthCheck([{"single": "yes"}], "single"));
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console.log(truthCheck([{"single": ""}, {"single": "double"}], "single"));
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console.log(truthCheck([{"single": "double"}, {"single": undefined}], "single"));
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console.log(truthCheck([{"single": "double"}, {"single": NaN}], "single"));

‎09-intermediate-algorithm-scripting/19-arguments-optional.js

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/*
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Arguments Optional:
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Create a function that sums two arguments together. If only one argument is provided, then return a function that expects
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one argument and returns the sum.
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For example, addTogether(2, 3) should return 5, and addTogether(2) should return a function.
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Calling this returned function with a single argument will then return the sum:
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var sumTwoAnd = addTogether(2);
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sumTwoAnd(3) returns 5.
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If either argument isn't a valid number, return undefined.
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- addTogether(2, 3) should return 5.
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- addTogether(23, 30) should return 53.
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- addTogether(5)(7) should return 12.
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- addTogether("https://www.youtube.com/watch?v=dQw4w9WgXcQ") should return undefined.
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- addTogether(2, "3") should return undefined.
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- addTogether(2)([3]) should return undefined.
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*/
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function addTogether() {
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let [arg1, arg2] = arguments;
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if (!Number.isInteger(arg1) || (arg2 !== undefined && !Number.isInteger(arg2))) {
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return undefined;
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}
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if (!arg2) {
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return function (newArg) {
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if (Number.isInteger(newArg)) {
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return arg1 + newArg;
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}
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}
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}
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return arg1 + arg2;
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}
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console.log(addTogether(2, 3));
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console.log(addTogether(23, 30));
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console.log(addTogether(5)(7));
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console.log(addTogether("https://www.youtube.com/watch?v=dQw4w9WgXcQ"));
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console.log(addTogether(2, "3"));
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console.log(addTogether(2)([3]));

‎09-intermediate-algorithm-scripting/20-make-a-person.js

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/*
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Make a Person:
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Fill in the object constructor with the following methods below:
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getFirstName()
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getLastName()
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getFullName()
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setFirstName(first)
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setLastName(last)
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setFullName(firstAndLast)
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Run the tests to see the expected output for each method. The methods that take an argument must accept only one
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argument and it has to be a string. These methods must be the only available means of interacting with the object.
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- No properties should be added. Object.keys(bob).length should always return 6.
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- bob instanceof Person should return true.
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- bob.firstName should return undefined.
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- bob.lastName should return undefined.
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- bob.getFirstName() should return the string Bob.
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- bob.getLastName() should return the string Ross.
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- bob.getFullName() should return the string Bob Ross.
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- bob.getFullName() should return the string Haskell Ross after bob.setFirstName("Haskell").
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- bob.getFullName() should return the string Haskell Curry after bob.setLastName("Curry").
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- bob.getFullName() should return the string Haskell Curry after bob.setFullName("Haskell Curry").
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- bob.getFirstName() should return the string Haskell after bob.setFullName("Haskell Curry").
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- bob.getLastName() should return the string Curry after bob.setFullName("Haskell Curry").
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*/
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const Person = function (firstAndLast) {
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// Only changed code below this line
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// Complete the method below and implement the others similarly
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let fullName = firstAndLast;
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this.getFirstName = function () {
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return fullName.split(/\s+/)[0];
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};
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this.getLastName = function () {
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return fullName.split(/\s+/)[1];
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};
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this.getFullName = function () {
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return fullName;
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};
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this.setFirstName = function (name) {
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fullName = `${name} ${fullName.split(/\s+/)[1]}`;
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};
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this.setLastName = function (name) {
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fullName = `${fullName.split(/\s+/)[0]} ${name}`;
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};
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this.setFullName = function (name) {
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fullName = name;
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};
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};
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const bob = new Person('Bob Ross');
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console.log(bob.getFullName());

‎09-intermediate-algorithm-scripting/21-map-the-debris.js

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/*
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Map the Debris
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Return a new array that transforms the elements' average altitude into their orbital periods (in seconds).
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The array will contain objects in the format {name: 'name', avgAlt: avgAlt}.
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You can read about orbital periods on Wikipedia (https://en.wikipedia.org/wiki/Orbital_period).
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The values should be rounded to the nearest whole number. The body being orbited is Earth.
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The radius of the earth is 6367.4447 kilometers, and the GM value of earth is 398600.4418 km3s-2.
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- orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}]) should return [{name: "sputnik", orbitalPeriod: 86400}].
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- orbitalPeriod([{name: "iss", avgAlt: 413.6}, {name: "hubble", avgAlt: 556.7}, {name: "moon", avgAlt: 378632.553}]) should return [{name : "iss", orbitalPeriod: 5557}, {name: "hubble", orbitalPeriod: 5734}, {name: "moon", orbitalPeriod: 2377399}].
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*/
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const GM = 398600.4418;
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const EARTH_RADIUS = 6367.4447;
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function orbitalPeriod(arr) {
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return arr.map(element => ({
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name: element.name,
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orbitalPeriod: findOrbPeriod(element.avgAlt)
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}));
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}
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function findOrbPeriod(alt) {
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const axis = alt + EARTH_RADIUS;
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return Math.round(2 * Math.PI * Math.sqrt(Math.pow(axis, 3) / GM));
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}
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console.log(orbitalPeriod([{name: "sputnik", avgAlt: 35873.5553}]));
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console.log(orbitalPeriod([
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{name: "iss", avgAlt: 413.6},
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{name: "hubble", avgAlt: 556.7},
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{name: "moon", avgAlt: 378632.553}]));

‎09-intermediate-algorithm-scripting/README.md

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- [X] [ 10 - Sorted Union](10-sorted-union.js)
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- [X] [ 11 - Convert HTML Entities](11-convert-html-entities.js)
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- [X] [ 12 - Sum All Odd Fibonacci Numbers](12-sum-all-odd-fibonacci-numbers.js)
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- [ ] [ 13 - Sum All Primes](13-sum-all-primes.js)
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- [ ] [ 14 - Smallest Common Multiple]()
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- [ ] [ 15 - Drop it]()
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- [ ] [ 16 - Steamroller]()
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- [ ] [ 17 - Binary Agents]()
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- [ ] [ 18 - Everything Be True]()
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- [ ] [ 19 - Arguments Optional]()
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- [ ] [ 20 - Make a Person]()
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- [ ] [ 21 - Map the Debris]()
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- [X] [ 13 - Sum All Primes](13-sum-all-primes.js)
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- [X] [ 14 - Smallest Common Multiple](14-smallest-common-multiple.js)
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- [X] [ 15 - Drop it](15-drop-it.js)
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- [X] [ 16 - Steamroller](16-steamroller.js)
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- [X] [ 17 - Binary Agents](17-binary-agents.js)
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- [X] [ 18 - Everything Be True](18-everything-be-true.js)
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- [X] [ 19 - Arguments Optional](19-arguments-optional.js)
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- [X] [ 20 - Make a Person](20-make-a-person.js)
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- [X] [ 21 - Map the Debris](21-map-the-debris.js)
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⬅️ [Back to main file](../README.md)
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‎README.md

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- [X] [ 06 - Basic Algorithm Scripting](/06-basic-algorithm-scripting/README.md)
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- [X] [ 07 - Object Oriented Programming](/07-object-oriented-programming/README.md)
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- [X] [ 08 - Functional Programming](/08-functional-programming/README.md)
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- [ ] [ 09 - Intermediate Algorithm Scripting](/09-intermediate-algorithm-scripting/README.md)
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- [X] [ 09 - Intermediate Algorithm Scripting](/09-intermediate-algorithm-scripting/README.md)
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- [ ] [ 10 - JavaScript Algorithms and Data Structures Projects]()
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