diff options
Diffstat (limited to 'js/src/tests/test262/built-ins/Array/prototype/at/returns-item.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/prototype/at/returns-item.js | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/at/returns-item.js b/js/src/tests/test262/built-ins/Array/prototype/at/returns-item.js new file mode 100644 index 0000000000..be25e281f4 --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/prototype/at/returns-item.js @@ -0,0 +1,37 @@ +// 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 +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 = [1, 2, 3, 4,,5]; + +assert.sameValue(a.at(0), 1, 'a.at(0) must return 1'); +assert.sameValue(a.at(1), 2, 'a.at(1) must return 2'); +assert.sameValue(a.at(2), 3, 'a.at(2) must return 3'); +assert.sameValue(a.at(3), 4, 'a.at(3) must return 4'); +assert.sameValue(a.at(4), undefined, 'a.at(4) returns undefined'); +assert.sameValue(a.at(5), 5, 'a.at(5) must return 5'); + +reportCompare(0, 0); |