1563354 - Array.prototype.reduce()

Status: RESOLVED INVALID

(developer.mozilla.org Graveyard :: Collaboration, defect)

Description

[brizid]

What did you do?

1.  Expected output with error.

What happened?

Exemple:

const array1 = [10.1, 10.2, 10.3, 10.4];
const reducer = (accumulator, currentValue) => accumulator + currentValue;

console.log(array1.reduce(reducer));
// expected output: 41

console.log(array1.reduce(reducer, 5));
// expected output: 46

What should have happened?

Present the correct result.
// Result
//> 41
//> 45.99999999999999

Is there anything else we should know?

Comment 1

[brizid]

Attachment: bug reduce.png

Comment 2

[Chris Mills [:cmills]]

I've tested the array values you are using in Chrome and Firefox, both in the interactive MDN example, and in the devtools, and they all give the same unexpected result. So this looks more like a quirk of how JS behaves than a problem with MDN or Firefox.