794065 - array spread operator messes up holes at the end of the literal

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

[:Benjamin Peterson]

Attachment: correctly figure out if a hole is at the end in the spread case

var a = [1,2,3];
console.log([...a,,,,]);              // [1,2,3]
console.log([...a,,,,].length);    // 3
console.log([...a,,,,,]);             // [1,2,3,,]
console.log([...a,,,,,].length);   // 5
console.log([...a,,,,,,]);            // [1,2,3, , , ]
console.log([...a,,,,,,].length);  // 6

(Thanks Aaron Frost.)

Comment 1

[:Benjamin Peterson]

https://hg.mozilla.org/integration/mozilla-inbound/rev/5515b887c42c

Comment 2

[Mounir Lamouri (:mounir)]

https://hg.mozilla.org/mozilla-central/rev/5515b887c42c