Mapping JS

Declare

const testMap = new Map()

set map

testMap.set(1,{name:"boris",cash:345});

testMap.set(2,{name:"tony",cash:45});

testMap.set(3,{name:"peter",cash:5});

Map {1 => Object {name: "boris", cash: 345}, 2 => Object {name: "tony", cash: 45}, 3 => Object {name: "peter", cash: 5}}

properties

testMap.size

3

testMap.has(2)

true

testMap.has(56)

false

methods

testMap.get(3).name

"peter"

for loop

//first item in array is key and second is value

for(let item of testMap){ console.log( item[1].cash)}//value

345

45

5

for(let item of testMap.keys()){ console.log( item)}

1

2

3