map javascript
var numbers = [1, 4, 9];
var doubles = numbers.map(function(num) {
return num * 2;
});
// doubles is now [2, 8, 18]. numbers still [1, 4, 9]map javascript
var numbers = [1, 4, 9];
var doubles = numbers.map(function(num) {
return num * 2;
});
// doubles is now [2, 8, 18]. numbers still [1, 4, 9]map in js
//map() methods returns a new array
const data = {name: "laptop", brands: ["dell", "acer", "asus"]}
let inside_data = data.brands.map((i) => {
console.log(i); //dell acer asus
});map javascript
function map(collection, action) {
let result = [];
if (Array.isArray(collection)) {
for (let i = 0; i < collection.length; i++) {
result.push(action(collection[i], i, collection));
}
}
else {
for (let key in collection) {
result.push(action(collection[key], key, collection));
}
} return result;
}Copyright © 2021 Codeinu
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