Difference between sort compare function in Javascript

Question

var arr = [undefined,null, NaN , Infinity];

sample.sort((a,b)=> a-b)

Answer : [Infinity, NaN, null, undefined]

sample.sort((a,b)=> a>b ? 1 : -1)

Answer : [null, NaN, Infinity, undefined]

Can anyone explain why there is a difference between the sort function?

Then where should be use - and > ??? Is there any specific datatype ?? — swa49
– swa49, Commented Dec 24, 2020 at 1:27

Siva Kondapi Venkata · Accepted Answer · 2020-12-27 05:59:49Z

1

sort compare method does the following possible comparisons for both cases. This explains the discrepancy in output

const output = [];
[Infinity, NaN, null, undefined].forEach((a, i, arr) =>
  arr.forEach((b) => output.push({ 
    a, 
    b, 
    "a - b": a - b, 
    "a>b ? 1 : -1": (a>b ? 1 : -1) 
  }))
);

console.log(output)
console.table(output);

edited Dec 27, 2020 at 5:59

answered Dec 24, 2020 at 5:59

Siva Kondapi Venkata

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