ES6基础之——Map

let food = new Map();
console.log(food); //Map{}

let food = new Map();
let fruit ={},cook=function(){},dessert="甜点";
food.set(fruit,‘apple‘);
console.log(food); //Map{Object => {"apple"}}

let food = new Map();
let fruit ={},cook=function(){},dessert="甜点";
food.set(fruit,‘apple‘);
food.set(cook,‘fork‘);
food.set(dessert,‘donut‘);
console.log(food); //Map{Object => {"apple"},function function=>"fork", "甜点"=>"donut"}

console.log(food.size); //3

console.log(food.get(fruit)); //apple
console.log(food.get(cook)); //fork

food.delete(dessert);
console.log(food.has(dessert)); //false

food.forEach((key,value) =>{
　　console.log(‘${key} = ${value}‘); //[object object] = apple function cook(){} = fork
})

food.clear();
console.log(food); //Map{}