Traversal of Map in JS (transfer)

Reposted from : Traversal of Map in JS

1. forEach traversal

const map = new Map([['key1','v1'],['key2','v2'],['key3','v3']]);
console.log(map);
map.forEach((val,key) => {
  console.log(val,key); // 先输出value，再输出key
})
/**
v1 key1
v2 key2
v3 key3 
 */

2、for…of…

for(let i of map) {
  console.log(i); // 先输出value，再输出key
}
/**
[ 'key1', 'v1' ]
[ 'key2', 'v2' ]
[ 'key3', 'v3' ] 
 */

3. for...of... with array deconstruction

//搭配解构赋值
for(let [key,val] of map) {
  console.log(key,val);
}
/**
key1 v1
key2 v2
key3 v3
 */

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Original link: https://blog.csdn.net/qq_44742090/article/details/123794872

Reposted from : Traversal of Map in JS