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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
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'
);
});
|
