how to use the map method in javascript
const numbers = [1, 2, 3, 4, 5];
const bigNumbers = numbers.map(number => {
return number * 10;
});how to use the map method in javascript
const numbers = [1, 2, 3, 4, 5];
const bigNumbers = numbers.map(number => {
return number * 10;
});map object
let myMap = new Map()
let keyString = 'a string'
let keyObj = {}
let keyFunc = function() {}
// setting the values
myMap.set(keyString, "value associated with 'a string'")
myMap.set(keyObj, 'value associated with keyObj')
myMap.set(keyFunc, 'value associated with keyFunc')
myMap.size // 3
// getting the values
myMap.get(keyString) // "value associated with 'a string'"
myMap.get(keyObj) // "value associated with keyObj"
myMap.get(keyFunc) // "value associated with keyFunc"
myMap.get('a string') // "value associated with 'a string'"
// because keyString === 'a string'
myMap.get({}) // undefined, because keyObj !== {}
myMap.get(function() {}) // undefined, because keyFunc !== function () {}Copyright © 2021 Codeinu
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