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 in javascript
let myMap = new Map()
let keyString = 'a string'
let keyObj = {}
// 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"map function in js
let kvArray = [{key: 1, value: 10},
{key: 2, value: 20},
{key: 3, value: 30}]
let reformattedArray = kvArray.map(obj => {
let rObj = {}
rObj[obj.key] = obj.value
return rObj
})
// reformattedArray is now [{1: 10}, {2: 20}, {3: 30}],
// kvArray is still:
// [{key: 1, value: 10},
// {key: 2, value: 20},
// {key: 3, value: 30}]Copyright © 2021 Codeinu
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