数组转对象,对象转数组

左手的ㄟ右手 2023-02-28 12:43 49阅读 0赞

数组到对象

新手

  1. let arr = ["value1", "value2", "value3"]; 
  2. let arrObject = {};
  3. for (let i = 0; i < arr.length; ++i) {
  4.    if (arr[i] !== undefined) {
  5.      arrObject[i] = arr[i];
  6.    }
  7. }

老手

  1. let arr = ["value1", "value2", "value3"]; 
  2. let arrObject = {...arr};

对象到数组

新手

  1. let number = {
  2.   one: 1, 
  3.   two: 2,
  4. };
  5. let keys = []; 
  6. for (let numbers in number) {
  7.   if (number.hasOwnProperty(numbers)) {
  8.      keys.push(numbers);
  9.     }
  10. }
  11. // key = [ 'one', 'two' ]

老手

  1. let numbers = {
  2.   one: 1, 
  3.   two: 2,
  4. };
  5. let key = Object.keys(numbers); // key = [ 'one', 'two' ]
  6. let value = Object.values(numbers);  // value = [ 1, 2 ]
  7. let entry = Object.entries(numbers); // entry = [['one' : 1], ['two' : 2]]

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