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// 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
es6id: 22.2.3.5
description: >
Set values with negative target argument.
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 ] )
...
4. If relativeTarget < 0, let to be max((len + relativeTarget), 0); else let
to be min(relativeTarget, len).
...
includes: [compareArray.js, testTypedArray.js]
---*/
testWithTypedArrayConstructors(function(TA) {
assert(
compareArray(
new TA([0, 1, 2, 3]).copyWithin(-1, 0), [0, 1, 2, 0]
),
'[0, 1, 2, 3].copyWithin(-1, 0) -> [0, 1, 2, 0]'
);
assert(
compareArray(
new TA([0, 1, 2, 3, 4]).copyWithin(-2, 2), [0, 1, 2, 2, 3]
),
'[0, 1, 2, 3, 4].copyWithin(-2, 2) -> [0, 1, 2, 2, 3]'
);
assert(
compareArray(
new TA([0, 1, 2, 3]).copyWithin(-1, 2), [0, 1, 2, 2]
),
'[0, 1, 2, 3].copyWithin(-1, 2) -> [0, 1, 2, 2]'
);
});
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