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I'm trying to sort an array of objects in JS, but for some reason it doesnt work :(

This is the code I'm running:

let  myArr = [{"name": "a", "age": 21}, {"name": "b", "age": 18}, {"name": "c", "age": 20}];
console.log(myArr.sort((a, b) => {
    return a["age"] > b["age"];
}))

The output is the same array as it was declared:

[
  { name: 'a', age: 21 },
  { name: 'b', age: 18 },
  { name: 'c', age: 21 }
]

When I looked it up it seemed like it's written as it should, not really sure what went wrong.

Any idea what I did wrong?

davidalk
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    You can use `-` instead of `>`. So that's `myArr.sort((a, b) => a.age - b.age)`. If you want the eldest first, you can use `b.age - a.age`. – Dan Mar 29 '21 at 10:07
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    Does this answer your question? [Sorting an array of objects by property values](https://stackoverflow.com/questions/979256/sorting-an-array-of-objects-by-property-values) – Mark Baijens Mar 29 '21 at 10:14

2 Answers2

3

Use - instead of >. It should return a Number type rather than Boolean type. see sort on mdn

let myArr = [
  { name: "a", age: 21 },
  { name: "b", age: 18 },
  { name: "c", age: 20 },
];
console.log(
  myArr.sort((a, b) => {
    return a["age"] - b["age"];
  })
);

Using one-liner syntax using arrow function

let myArr = [
  { name: "a", age: 21 },
  { name: "b", age: 18 },
  { name: "c", age: 20 },
];
console.log(myArr.sort((a, b) => a.age - b.age));
DecPK
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0

Dataset

let arr = [
    { name: 'A', age: 40 },
    { name: 'B', age: 50 },
    { name: 'C', age: 30 },
]

Sort: Ascending order on age values

arr?.sort((a, b) => {
        return a?.age-b?.age
})

Sort: Descending order on age values

arr?.sort((a, b) => {
        return b?.age-a?.age
})
Md. Saifur Rahman
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