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Diffstat (limited to 'js/src/tests/test262/built-ins/Array/prototype/findLast/return-undefined-if-predicate-returns-false-value.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/prototype/findLast/return-undefined-if-predicate-returns-false-value.js | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/findLast/return-undefined-if-predicate-returns-false-value.js b/js/src/tests/test262/built-ins/Array/prototype/findLast/return-undefined-if-predicate-returns-false-value.js new file mode 100644 index 0000000000..6ce25bdaef --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/prototype/findLast/return-undefined-if-predicate-returns-false-value.js @@ -0,0 +1,55 @@ +// Copyright (C) 2021 Microsoft. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. +/*--- +esid: sec-array.prototype.findlast +description: > + Return undefined if predicate always returns a boolean false value. +info: | + Array.prototype.findLast ( predicate[ , thisArg ] ) + + ... + 5. Repeat, while k ≥ 0, + ... + c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)). + ... + 6. Return undefined. +features: [Symbol, array-find-from-last] +---*/ + +var arr = ['Shoes', 'Car', 'Bike']; +var called = 0; + +var result = arr.findLast(function() { + called++; + return false; +}); + +assert.sameValue(called, 3, 'predicate was called three times'); +assert.sameValue(result, undefined); + +result = arr.findLast(function() { + return ''; +}); +assert.sameValue(result, undefined, 'coerced string'); + +result = arr.findLast(function() { + return undefined; +}); +assert.sameValue(result, undefined, 'coerced undefined'); + +result = arr.findLast(function() { + return null; +}); +assert.sameValue(result, undefined, 'coerced null'); + +result = arr.findLast(function() { + return 0; +}); +assert.sameValue(result, undefined, 'coerced 0'); + +result = arr.findLast(function() { + return NaN; +}); +assert.sameValue(result, undefined, 'coerced NaN'); + +reportCompare(0, 0); |