| // 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.copywithin |
| description: > |
| end argument is coerced to an integer values. |
| info: | |
| 22.2.3.5 %TypedArray%.prototype.copyWithin (target, start [ , end ] ) |
| |
| %TypedArray%.prototype.copyWithin is a distinct function that implements the |
| same algorithm as Array.prototype.copyWithin as defined in 22.1.3.3 except |
| that the this object's [[ArrayLength]] internal slot is accessed in place of |
| performing a [[Get]] of "length" and the actual copying of values in step 12 |
| must be performed in a manner that preserves the bit-level encoding of the |
| source data. |
| |
| ... |
| |
| 22.1.3.3 Array.prototype.copyWithin (target, start [ , end ] ) |
| |
| ... |
| 7. If end is undefined, let relativeEnd be len; else let relativeEnd be ? |
| ToInteger(end). |
| ... |
| includes: [compareArray.js, testTypedArray.js] |
| features: [TypedArray] |
| ---*/ |
| |
| testWithTypedArrayConstructors(function(TA) { |
| assert( |
| compareArray( |
| new TA([0, 1, 2, 3]).copyWithin(1, 0, null), |
| [0, 1, 2, 3] |
| ), |
| 'null value coerced to 0' |
| ); |
| |
| assert( |
| compareArray( |
| new TA([0, 1, 2, 3]).copyWithin(1, 0, NaN), |
| [0, 1, 2, 3] |
| ), |
| 'NaN value coerced to 0' |
| ); |
| |
| assert( |
| compareArray( |
| new TA([0, 1, 2, 3]).copyWithin(1, 0, false), |
| [0, 1, 2, 3] |
| ), |
| 'false value coerced to 0' |
| ); |
| |
| assert( |
| compareArray( |
| new TA([0, 1, 2, 3]).copyWithin(1, 0, true), |
| [0, 0, 2, 3] |
| ), |
| 'true value coerced to 1' |
| ); |
| |
| assert( |
| compareArray( |
| new TA([0, 1, 2, 3]).copyWithin(1, 0, '-2'), |
| [0, 0, 1, 3] |
| ), |
| 'string "-2" value coerced to integer -2' |
| ); |
| |
| assert( |
| compareArray( |
| new TA([0, 1, 2, 3]).copyWithin(1, 0, -2.5), |
| [0, 0, 1, 3] |
| ), |
| 'float -2.5 value coerced to integer -2' |
| ); |
| }); |