How to turn object with array into array?-CodePudding

I'm trying to turn the values of an array inside an object to a normal array.

Right now I'm doing something like this in my AJAX success function:

var obj = data
              
console.log(obj)

var array = Object.keys(obj)
 .map(function(key) {
   return obj[key];
 });

console.log(array)

This is what I get in my console:

{jaar: Array(2)}
 jaar: Array(2)
  0: YEAR(Scan): "2020"
   [[Prototype]]: Object
  1: YEAR(Scan): "2021"
   [[Prototype]]: Object
  length: 2
  [[Prototype]]: Array(0)
  [[Prototype]]: Object

I want to have something simply as this

["2020", "2021"]

How can I achieve this and what am I doing wrong right now?

console.log(obj) at the start gives this output in the console:

jaar: Array(2)
0: {YEAR(Scan): '2020'}
1: {YEAR(Scan): '2021'}
length: 2
[[Prototype]]: Array(0)
[[Prototype]]: Object ```

CodePudding user response：

If you have a plain object like const obj = { x: 10, y: 20 } and you want to have an array of its values, you can simply use Object.values(obj) that will return you [10, 20].

Seems like your object has more complex structure.

If you know for sure, any value of your object is a value or array, like const obj2 = { x: 10, y: [20, 30, 40], z: [50, 60]} you can flatten it.

Object.values(obj2).flat() will return you [10, 20, 30, 40, 50, 60].

For more complex structures you need to have more complex handlers.

CodePudding user response：

jaar is already an array of objects. You can simply use .map() and get the respective property value from each array element.

let ans =jaar.map(x => x['YEAR(Scan)']);

CodePudding user response：

Other answer provides the must succinct code (using .map) - to make the the smallest change to your existing code, change:

You can read the YEAR(Scan) property like so:

return obj[key]["YEAR(Scan)"];

Updated code:

var obj = 
  [ 
    { "YEAR(Scan)":"2020" },
    { "YEAR(Scan)":"2021" }
  ]
  

console.log(obj)

var array = Object.keys(obj)
 .map(function(key) {
   return obj[key]["YEAR(Scan)"];
 });

console.log(array)