Run results for: set array index: slice vs Object.assign v3

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0

Browser: Firefox 87

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Tests:

splice
var index = 2; var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var output = [ ...array.slice(0, index), 10, ...array.slice(index + 1) ];
Object.assign spread
var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var output = Object.assign([...array], {2: 10});
Object.assign slice
var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var output = Object.assign(array.slice(), {2: 10});
Object.assign orig
var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var output = Object.assign([...array], {2: 10});
Slice mutable
var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var newArray = array.slice(); newArray[2] = 10; var output = newArray;
slice mutable spread
var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var newArray = [...array]; newArray[2] = 10; var output = newArray;