test case questions - update

problems/problem1.js

@@ -2,17 +2,34 @@ var assert = require('assert');
 
 // we need 5 test cases. I provided 1 input
 let inputs = [
-  ""
+  "",
+  "hello",
+  "abc",
+  "123",
+  "cat"
 ]
 
 let outputs = [
+  undefined,
+  "h",
+  "a",
+  "1",
+  "c"
 
 ]
 
-// Make this function return the first letter of the string that is passed to it. If the string does not have a first letter, return undefined
+// Make this function return the first letter of the string that is passed to it.
+//  If the string does not have a first letter, return undefined
+
 function f(str) {
-
-}
+  if (typeof str !== "string"){
+    return undefined;
+  }
+    else {
+      return str[0];
+    }
+  };
+
 
 function runTest(i) {
     var expected = outputs[i];

problems/problem10.js

@@ -1,24 +1,43 @@
-var assert = require('assert');
+ var assert = require('assert');
 
 // we need 5 test cases. 
 let inputs = [
+"hello WORLD",
+"hi there",
+'BONJOUR',
+"what THE F",
+"ok OK OK"
 
 ]
 
 let outputs = [
+    "Hello World",
+    "Hi There",
+    "Bonjour",
+    "What The F",
+    "Ok Ok Ok"
 
 ]
 
 /*
-Make this function return the input string, capitalized. You must use a for loop. For example:
+Make this function return the input string, capitalized. You must use 
+a for loop. For example:
 
 f("hello world"); // Hello World
 f("ALL YOUR BASE ARE BELONG"); // All Your Base Are Belong
 
 */
-function f(str) {
-
+function f(str){
+    tempArray= str.toLowerCase().split(' ');
+    for (let i=0; i <tempArray.length; i ++){
+        tempArray[i] = tempArray[i].split('');
+        tempArray[i][0]=tempArray[i][0].toUpperCase();
+        tempArray[i]= tempArray[i].join('');
+    }
+    return  tempArray.join(' ');
 }
+
+
 
 function runTest(i) {
     if(i > inputs.length) throw new Error("You do not have enough test cases");

problems/problem11.js

@@ -2,20 +2,40 @@ var assert = require('assert');
 
 // we need 5 test cases. 
 let inputs = [
+    [1,1,1],
+    [],
+    [1,"cat",1],
+    [2,3,4],
+    [true,"cat",1]
 
 ]
 
 let outputs = [
+    3,
+    0,
+    2,
+    9,
+    1
 
 ]
 
 /*
-Make this function return the sum of all the numbers in the input array. If any element in the array is not a number, skip it. If the array is empty, return zero.
+Make this function return the sum of all the numbers in the input array. 
+If any element in the array is not a number, skip it. 
+If the array is empty, return zero.
 */
 function f(arr) {
-
+    var sum =0;
+    for (let i=0; i< arr.length; i ++){
+        if (typeof arr[i] === "number"){
+            sum += arr[i];
+        }
+    }
+   return sum;
 }
 
+
+
 function runTest(i) {
     if(i > inputs.length) throw new Error("You do not have enough test cases");
     var expected = outputs[i];

problems/problem12.js

@@ -2,12 +2,22 @@ var assert = require('assert');
 
 // we need 5 test cases. 
 let inputs = [
+    [[0,1,2,3],[1,3,4,5]],
+    [[3,4,22],[22,6,4]],
+    [[10,10,3],2],
+    [[2,2,2],[2,2,2]],
+    [[1,4,3],[1,3,3]]
 
-]
+];
 
 let outputs = [
+    [0,2,4,5],
+    [3,4,6],
+    [2,3],
+    [],
+    [4]
 
-]
+];
 
 /*
 Make this function return the elements that are unique to array1 and array2.
@@ -19,16 +29,44 @@ uniqueElements([0,1,2,3], [1,3,4,5]); // [0,4,5]
 uniqueElements([1,2,3], [1,2,3]); // []
 uniqueElements(2,3); // undefined, not arrays
 */
+
+/*
+member(x,lst) returns true if and only if x is an element of lst
+*/
+
+function member (x, lst){
+    for (let i =0; i< lst.length; i ++ ){
+        if (lst[i]=== x) {return true}
+    } 
+    return false
+};
 function f(arr1, arr2) {
+    uniArr = [];
+    for (let i = 0;i<arr1.length; i ++){
+        if (member(arr1[i],arr2) === false && member(arr1,uniArr)===false) 
+        {
+            uniArr.push(arr1[i]);
+        }  
 
-}
+    }return uniArr;
+    for (let i = 0;i<arr2.length; i ++){
+        if (member(arr2[i],arr1) === false && member(arr2,uniArr)===false) 
+        {
+            uniArr.push(arr2[i]);
+        }  
+    }
+    return uniArr;
+
+};
+
 
 function runTest(i) {
     if(i > inputs.length) throw new Error("You do not have enough test cases");
     var expected = outputs[i];
-    var actual = f(inputs[i]);
+    var input = inputs[i];
+    var actual = f(input[0], input[1]);
     assert.deepEqual(actual, expected);
-}
+};
 
 runTest(0);
 runTest(1);

problems/problem13.js

@@ -2,20 +2,37 @@ var assert = require('assert');
 
 // we need 5 test cases. 
 let inputs = [
+    "racecAR",
+    "car",
+    "ogopogo",
+    "loop",
+    "Hanah"
 
 ]
 
 let outputs = [
+    true,
+    false,
+    true,
+    false,
+    true
 
 ]
 
 /*
-Make this function return true if the input string is a palindrome, and false otherwise. A palindrome is simply a string that is the same if you reverse it.
+Make this function return true if the input string is a palindrome, 
+and false otherwise. A palindrome is simply a string that is the same 
+if you reverse it.
 
 RADAR -> Yes
 JAVASCRIPT -> No
 */
+
 function f(str) {
+    var lowStr = str.toLowerCase();
+    if(lowStr === lowStr.split('').reverse().join('')){
+        return true
+    }else {return false};
 
 }
 

problems/problem14.js

@@ -11,7 +11,8 @@ let outputs = [
 
 /*
 Make this function return the input string wrapped to 40 characters per line. 
-This means you'll have to insert a newline \n character after every 40 characters in the input string. 
+This means you'll have to insert a newline \n character after every 40 
+ characters in the input string. 
 If the next character after a cut is a space, then do not display it. 
 
 For example with the input:

problems/problem2.js

@@ -2,17 +2,33 @@ var assert = require('assert');
 
 // we need 5 test cases.
 let inputs = [
+    "",
+    "hello",
+    "abc",
+    "123",
+    "cat"
 
 ]
 
 let outputs = [
+    undefined,
+    "o",
+    "c",
+    "3",
+    "t"
 
 ]
 
 // Make this function return the last letter of the string that is passed to it. If the string does not have a last letter, return undefined
 function f(str) {
+    if (typeof str !== "string"){
+        return undefined
+    }else {
+        return str[str.length -1]
+    }
+    }
 
-}
+
 
 function runTest(i) {
     var expected = outputs[i];

problems/problem3.js

@@ -3,20 +3,37 @@ var assert = require('assert');
 // we need 7 test cases. I've provided 2.
 let inputs = [
   [2, 4],
-  [-3, 3]
+  [-3, 3],
+  ['a', 3],
+  [4],
+  [9, 11],
+  [2, 2],
+  [1, 1]
 ]
 
 let outputs = [
   6,
-  0
+  0,
+  undefined,
+  undefined,
+  20,
+  4,
+  2
 ]
 
 /*
-Make this function return the sum of the two numbers that are passed to it. If one of the numbers is not passed, or if anything other than numbers are passed, return undefined.
+Make this function return the sum of the two numbers that are passed to it.
+ If one of the numbers is not passed, or if anything other than numbers are passed,
+  return undefined.
 */
-function f(x, y) {
-
-}
+function f(x) {
+  if (typeof x[0] !== "number" || typeof x[1] !== "number"){
+    return undefined
+  } else {return x[0]+ x[1]}
+
+  }
+
+
 
 function runTest(i) {
     var expected = outputs[i];

problems/problem4.js

@@ -3,16 +3,32 @@ var assert = require('assert');
 // we need 8 test cases. I've provided the first 2
 let inputs = [
   ["hello", 4],
-  ["", 2]
+  ["", 2],
+  [1, 'hello'],
+  ["bonjour", 8],
+  [4,1],
+  [["abv"], 4],
+  ["hamburger", 5],
+  ['cat', -1]
+
 ]
 
 let outputs = [
   "o",
+  undefined,
+  undefined,
+  undefined,
+  undefined,
+  undefined,
+  "r",
   undefined
+
+
 ]
 
 /*
-Make this function return the letter at the specified position in the string. If no such letter exists, it should return undefined.
+Make this function return the letter at the specified position in the string. 
+If no such letter exists, it should return undefined.
 
 For example:
 f("hello", 1); // e
@@ -21,9 +37,17 @@ f("abc", 0); // a
 
 */
 function f(str, index) {
-
+  if (typeof str !== "string" || typeof index !== "number"){
+    return undefined
+  }else if ((index < str.length === false) || (index < 0 === true)){
+    return undefined
+  }else {
+    return str[index];
+  }
 }
 
+
+
 function runTest(i) {
     var expected = outputs[i];
     var input = inputs[i];