Sort array of objects by keys not working

Question

I have this array of objects:

let ans = [{'a' : 5},{'d' : 3 },{'c' : 0 },{'b' : 4 }];

//Attempt to sort this
ans.sort((a,b)=>{
  return Object.keys(a)[0] > Object.keys(b)[0];
});
console.log(ans);

Shouldn't this sort function sort it? If not this how to sort this.

It is happening because after comparing keys, it is evaluating to boolean, true gets converted to 1 but false gets converted to 0 instead of -1, hence your sort function is not working correctly. — Hassan Imam
– Hassan Imam, Commented Jun 19, 2021 at 7:43

fin444 · Accepted Answer · 2021-06-19 06:48:25Z

2

The function provided for array.sort() should return a number instead of a boolean. If a > b, then a number greater than 0 should be returned. If a < b, then a number less than 0.

let ans = [{'a' : 5},{'d' : 3 },{'c' : 0 },{'b' : 4 }];

//Attempt to sort this
console.log(ans.sort((a,b)=>{
  return Object.keys(a)[0] > Object.keys(b)[0] ? 1 : -1;
}));

answered Jun 19, 2021 at 6:48

fin444

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Rohan B · Accepted Answer · 2021-06-19 06:53:11Z

0

Alternatively you can use localeCompare

ans.sort((a,b)=>{
    return Object.keys(a)[0].localeCompare(Object.keys(b)[0]);
});

answered Jun 19, 2021 at 6:53

Rohan B

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