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| class myMap{ constructor(obj){ this.obj = {} this.length = 0 if(Array.isArray(obj)){ obj.every((item, index, arr) => { if(Array.isArray(item)){ this.obj[item[0]] = item[1] this.length += 1 return true }else{ this.obj = {} this.length = 0 return false } }) } }
has(key){ return this.obj.hasOwnProperty(key) }
size(){ return this.length }
get(key){ if(this.has(key)){ return this.obj[key] } }
set(key, value){ if(this.has(key)){ this.obj[key] = value }else{ this.obj[key] = value this.length += 1 } return this }
keys(){ return Object.keys(this.obj) }
values(){ return Object.values(this.obj) }
entries(){ return Object.entries(this.obj) }
delete(key){ if(this.has(key)){ this.length -= 1 delete this.obj[key] } return this }
clear(){ this.obj = {} this.length = 0 return this } }
let my_Map = new myMap() my_Map.set('foo', true).set('foo2', false).set('foo2', 1) console.log(my_Map);
let map = new Map() map.set('foo', true) map.set('foo2', false) console.log(map);
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