diff options
Diffstat (limited to 'js/src/tests/test262/built-ins/Array/prototype/at/returns-undefined-for-holes-in-sparse-arrays.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/prototype/at/returns-undefined-for-holes-in-sparse-arrays.js | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/at/returns-undefined-for-holes-in-sparse-arrays.js b/js/src/tests/test262/built-ins/Array/prototype/at/returns-undefined-for-holes-in-sparse-arrays.js new file mode 100644 index 0000000000..4c9a573b53 --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/prototype/at/returns-undefined-for-holes-in-sparse-arrays.js @@ -0,0 +1,45 @@ +// Copyright (C) 2020 Rick Waldron. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. +/*--- +esid: sec-array.prototype.at +description: > + Returns the item value at the specified index, respecting holes in sparse arrays. +info: | + Array.prototype.at ( ) + + Let O be ? ToObject(this value). + Let len be ? LengthOfArrayLike(O). + Let relativeIndex be ? ToInteger(index). + If relativeIndex ≥ 0, then + Let k be relativeIndex. + Else, + Let k be len + relativeIndex. + If k < 0 or k ≥ len, then return undefined. + Return ? Get(O, ! ToString(k)). + +features: [Array.prototype.at] +---*/ +assert.sameValue( + typeof Array.prototype.at, + 'function', + 'The value of `typeof Array.prototype.at` is expected to be "function"' +); + +let a = [0, 1, , 3, 4, , 6]; + +assert.sameValue(a.at(0), 0, 'a.at(0) must return 0'); +assert.sameValue(a.at(1), 1, 'a.at(1) must return 1'); +assert.sameValue(a.at(2), undefined, 'a.at(2) returns undefined'); +assert.sameValue(a.at(3), 3, 'a.at(3) must return 3'); +assert.sameValue(a.at(4), 4, 'a.at(4) must return 4'); +assert.sameValue(a.at(5), undefined, 'a.at(5) returns undefined'); +assert.sameValue(a.at(6), 6, 'a.at(6) must return 6'); +assert.sameValue(a.at(-0), 0, 'a.at(-0) must return 0'); +assert.sameValue(a.at(-1), 6, 'a.at(-1) must return 6'); +assert.sameValue(a.at(-2), undefined, 'a.at(-2) returns undefined'); +assert.sameValue(a.at(-3), 4, 'a.at(-3) must return 4'); +assert.sameValue(a.at(-4), 3, 'a.at(-4) must return 3'); +assert.sameValue(a.at(-5), undefined, 'a.at(-5) returns undefined'); +assert.sameValue(a.at(-6), 1, 'a.at(-6) must return 1'); + +reportCompare(0, 0); |