将 object 键和属性转换为数组

Question

function objectToArray(obj) {
  var newArr = [];
  var myKeys = Object.keys(obj);
  var myValues = Object.values(obj);

  for(var i=0; i<myKeys.length; i++) {
    newArr.push(myKeys[i]);
  }
  return newArr;
}

objectToArray({
  D: 1,
  B: 2,
  C: 3
});
  

// Should output  [["D", 1], ["B", 2], ["C", 3]]

Hello, Trying to put the values for each of these arrays in as specified. I keeping getting ['D1'] instead of ['D', 1]. Any idea how to place these values correctly?

Answer 1

You have to push an array, like this: [myKeys[i], myValues[i]]

 function objectToArray(obj) { var newArr = []; var myKeys = Object.keys(obj); var myValues = Object.values(obj); for (var i = 0; i < myKeys.length; i++) { newArr.push([myKeys[i], myValues[i]]); } return newArr; } const result = objectToArray({ D: 1, B: 2, C: 3, }); console.log(result); // [["D", 1], ["B", 2], ["C", 3]]

Answer 2

Building on @Manas Khandelwal, you could get the value directly from the obj if you have the key, so this is how I would do it:

function objectToArray(obj) {
  var newArr = [];
  for (let key in obj) {
        newArr.push([key, obj[key]]);
  }
  return newArr;
}

const result = objectToArray({
  D: 1,
  B: 2,
  C: 3,
});

console.log(result);

Answer 3

You are looking for Object.entries: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries . This function does exactly what you are looking for.