double for循环未获取返回数据

Question

Why my code is not count ?

var a = {
  count: [{label:'a', value: 'a'}],
  next: [{label:'b', value: 'b'}],
  previous: [{label:'c', value: 'c'}],
}

function get_item() {

  var x = "a"

  for (let item in a){
    a[item].forEach(obj => {
      console.log(obj.value, x )   
      if(obj.value === x) {
        return item
      }
    })
  }
}


console.log(get_item())

the console logs are bellow:

a a
b a
c a
undefined

you see the aa , but why it do not is the count rather than undefined ?

Answer 1

below solution may work for you:

 var a = {
        count: [{label:'a', value: 'a'}],
        next: [{label:'b', value: 'b'}],
        previous: [{label:'c', value: 'c'}]
       }
    function get_item() {
           var x = "a"
           for (let item in a){
            let resultItem = a[item].find((obj)=>{ return obj.value === x });
            if(resultItem) return item //you can also return 'resultItem';
            }
          }
          console.log(get_item())

Answer 2

change your function as such.

 var a = { count: [{label:'a', value: 'a'}], next: [{label:'b', value: 'b'}], previous: [{label:'c', value: 'c'}], } function get_item() { var x = "w" var retItem = undefined for (let item in a){ a[item].forEach(obj => { if(obj.value === x) { retItem = item } }) } return retItem; } console.log(get_item()) 

Here we just assign the result into a variable retItem . If we find something we return it, or we just return undefined