javascript object map by number values per key code example
Example 1: map add key to object in array javascript
const newArr = [
{name: 'eve'},
{name: 'john'},
{name: 'jane'}
].map(v => ({...v, isActive: true}))
Example 2: map in javascript
let myMap = new Map()
let keyString = 'a string'
let keyObj = {}
myMap.set(keyString, "value associated with 'a string'")
myMap.set(keyObj, 'value associated with keyObj')
myMap.set(keyFunc, 'value associated with keyFunc')
myMap.size
myMap.get(keyString)
myMap.get(keyObj)
myMap.get(keyFunc)