| // Copyright (C) 2016 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-%typedarray%.prototype.fill |
| description: > |
| Fills all the elements from a with a custom start index. |
| info: | |
| 22.2.3.8 %TypedArray%.prototype.fill (value [ , start [ , end ] ] ) |
| |
| %TypedArray%.prototype.fill is a distinct function that implements the same |
| algorithm as Array.prototype.fill as defined in 22.1.3.6 except that the this |
| object's [[ArrayLength]] internal slot is accessed in place of performing a |
| [[Get]] of "length". The implementation of the algorithm may be optimized with |
| the knowledge that the this value is an object that has a fixed length and |
| whose integer indexed properties are not sparse. However, such optimization |
| must not introduce any observable changes in the specified behaviour of the |
| algorithm. |
| |
| ... |
| |
| 22.1.3.6 Array.prototype.fill (value [ , start [ , end ] ] ) |
| |
| ... |
| 4. If relativeStart < 0, let k be max((len + relativeStart), 0); else let k be |
| min(relativeStart, len). |
| ... |
| includes: [compareArray.js, testTypedArray.js] |
| features: [TypedArray] |
| ---*/ |
| |
| testWithTypedArrayConstructors(function(TA) { |
| assert( |
| compareArray(new TA([0, 0, 0]).fill(8, 1), [0, 8, 8]), |
| "Fill elements from custom start position" |
| ); |
| |
| assert( |
| compareArray(new TA([0, 0, 0]).fill(8, 4), [0, 0, 0]), |
| "start position is never higher than length" |
| ); |
| |
| assert( |
| compareArray(new TA([0, 0, 0]).fill(8, -1), [0, 0, 8]), |
| "start < 0 sets initial position to max((len + relativeStart), 0)" |
| ); |
| |
| assert( |
| compareArray(new TA([0, 0, 0]).fill(8, -5), [8, 8, 8]), |
| "start position is 0 when (len + relativeStart) < 0" |
| ); |
| }); |