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map.js
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map.js
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const words = ["ground", "control", "to", "major", "tom"];
const map = function(array, callback) {
const results = [];
for (let item of array) {
results.push(callback(item));
// console.log('item BEFORE: ', item);
// console.log('item AFTER: ', callback(item));
// console.log('---');
}
return results;
};
const results1 = map(words, word => word[0]);
console.log(results1);
// insert assertArraysEqual and eqArrays for easy testing
const eqArrays = function(arr1, arr2) {
if (arr1.length !== arr2.length) {
return false;
}
for (let i = 0; i < arr1.length; i++) {
if (arr1[i] !== arr2[i]) {
return false;
}
} return true;
};
const assertArraysEqual = function(arr1, arr2) {
if (eqArrays(arr1, arr2)) {
return (`✅✅✅ Assertion Passed: ${arr1} === ${arr2}`);
} else {
return (`🔴🔴🔴 Assertion Failed: ${arr1} !== ${arr2}`);
}
};
//test case
assertArraysEqual(map(words, word => word.length), [6, 7, 2, 5, 3]);