diff options
Diffstat (limited to 'js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-val-falsey.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-val-falsey.js | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-val-falsey.js b/js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-val-falsey.js new file mode 100644 index 0000000000..c565bac64a --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-val-falsey.js @@ -0,0 +1,57 @@ +// Copyright (C) 2015 the V8 project authors. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. +/*--- +esid: sec-array.prototype.concat +description: > + The `Symbol.isConcatSpreadable` property is defined and coerces to `false` +info: | + 1. Let O be ToObject(this value). + 2. ReturnIfAbrupt(O). + 3. Let A be ArraySpeciesCreate(O, 0). + 4. ReturnIfAbrupt(A). + 5. Let n be 0. + 6. Let items be a List whose first element is O and whose subsequent + elements are, in left to right order, the arguments that were passed to + this function invocation. + 7. Repeat, while items is not empty + a. Remove the first element from items and let E be the value of the element. + b. Let spreadable be IsConcatSpreadable(E). + c. ReturnIfAbrupt(spreadable). + d. If spreadable is true, then + [...] + e. Else E is added as a single item rather than spread, + [...] + + ES6 22.1.3.1.1: Runtime Semantics: IsConcatSpreadable ( O ) + + 1. If Type(O) is not Object, return false. + 2. Let spreadable be Get(O, @@isConcatSpreadable). + 3. ReturnIfAbrupt(spreadable). + 4. If spreadable is not undefined, return ToBoolean(spreadable). +features: [Symbol.isConcatSpreadable] +---*/ + +var item = [1, 2]; +var result; + +item[Symbol.isConcatSpreadable] = null; +result = [].concat(item); +assert.sameValue(result.length, 1, 'The value of result.length is expected to be 1'); +assert.sameValue(result[0], item, 'The value of result[0] is expected to equal the value of item'); + +item[Symbol.isConcatSpreadable] = false; +result = [].concat(item); +assert.sameValue(result.length, 1, 'The value of result.length is expected to be 1'); +assert.sameValue(result[0], item, 'The value of result[0] is expected to equal the value of item'); + +item[Symbol.isConcatSpreadable] = 0; +result = [].concat(item); +assert.sameValue(result.length, 1, 'The value of result.length is expected to be 1'); +assert.sameValue(result[0], item, 'The value of result[0] is expected to equal the value of item'); + +item[Symbol.isConcatSpreadable] = NaN; +result = [].concat(item); +assert.sameValue(result.length, 1, 'The value of result.length is expected to be 1'); +assert.sameValue(result[0], item, 'The value of result[0] is expected to equal the value of item'); + +reportCompare(0, 0); |