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map.js
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map.js
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const eqArray = function(firstArray, secondArray) {
if (firstArray.length !== secondArray.length) {
return false;
} else {
for (let i = 0; i < firstArray.length; i++) {
if (firstArray[i] !== secondArray[i]) {
return false;
}
}
return true;
}
};
const assertArrayEqual = function(firstArr,secondArr) {
if (eqArray(firstArr,secondArr) === true) {
console.log(`✅✅ Assertion Passed! [${firstArr}] === [${[secondArr]}]`);
} else {
console.log(`🔴🔴 Assertion Failed! [${firstArr}] !== [${secondArr}]`);
}
};
const words = ["ground", "control", "to", "major", "tom"];
const map = function(array, callback) {
const results = [];
for (let item of array) {
results.push(callback(item));
}
return results;
};
module.exports = map;
// Test cases
const results1 = map(words, word => word[0]);
assertArrayEqual(results1,["g","c","t","m","t"]);
let testArray = [1,2,3,4];
let results = map(testArray, num => num * 2);
assertArrayEqual(results,[2,4,6,8]);
testArray = [9,16,25,100];
results = map(testArray, num => Math.sqrt(num));
assertArrayEqual(results,[3,4,5,10]);