mirror of https://github.com/tc39/test262.git
Add tests for @@isConcatSpreadable
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// Copyright (C) 2015 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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es6id: 22.1.3.1
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description: Error thrown when accessing `Symbol.isConcatSpreadable` property
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info: >
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1. Let O be ToObject(this value).
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2. ReturnIfAbrupt(O).
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3. Let A be ArraySpeciesCreate(O, 0).
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4. ReturnIfAbrupt(A).
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5. Let n be 0.
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6. Let items be a List whose first element is O and whose subsequent
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elements are, in left to right order, the arguments that were passed to
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this function invocation.
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7. Repeat, while items is not empty
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a. Remove the first element from items and let E be the value of the element.
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b. Let spreadable be IsConcatSpreadable(E).
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c. ReturnIfAbrupt(spreadable).
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ES6 22.1.3.1.1: Runtime Semantics: IsConcatSpreadable ( O )
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1. If Type(O) is not Object, return false.
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2. Let spreadable be Get(O, @@isConcatSpreadable).
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3. ReturnIfAbrupt(spreadable).
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features: [Symbol.isConcatSpreadable]
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---*/
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var o = {};
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Object.defineProperty(o, Symbol.isConcatSpreadable, {
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get: function() {
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throw new Test262Error();
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}
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});
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assert.throws(Test262Error, function() {
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Array.prototype.concat.call(o);
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});
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// Copyright (C) 2015 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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es6id: 22.1.3.1
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description: >
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The `Symbol.isConcatSpreadable` property is defined and coerces to `false`
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info: >
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1. Let O be ToObject(this value).
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2. ReturnIfAbrupt(O).
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3. Let A be ArraySpeciesCreate(O, 0).
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4. ReturnIfAbrupt(A).
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5. Let n be 0.
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6. Let items be a List whose first element is O and whose subsequent
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elements are, in left to right order, the arguments that were passed to
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this function invocation.
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7. Repeat, while items is not empty
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a. Remove the first element from items and let E be the value of the element.
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b. Let spreadable be IsConcatSpreadable(E).
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c. ReturnIfAbrupt(spreadable).
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d. If spreadable is true, then
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[...]
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e. Else E is added as a single item rather than spread,
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[...]
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ES6 22.1.3.1.1: Runtime Semantics: IsConcatSpreadable ( O )
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1. If Type(O) is not Object, return false.
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2. Let spreadable be Get(O, @@isConcatSpreadable).
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3. ReturnIfAbrupt(spreadable).
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4. If spreadable is not undefined, return ToBoolean(spreadable).
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features: [Symbol.isConcatSpreadable]
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---*/
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var item = [1, 2];
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var result;
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item[Symbol.isConcatSpreadable] = null;
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result = [].concat(item);
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assert.sameValue(result.length, 1);
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assert.sameValue(result[0], item);
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item[Symbol.isConcatSpreadable] = false;
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result = [].concat(item);
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assert.sameValue(result.length, 1);
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assert.sameValue(result[0], item);
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item[Symbol.isConcatSpreadable] = 0;
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result = [].concat(item);
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assert.sameValue(result.length, 1);
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assert.sameValue(result[0], item);
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item[Symbol.isConcatSpreadable] = NaN;
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result = [].concat(item);
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assert.sameValue(result.length, 1);
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assert.sameValue(result[0], item);
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// Copyright (C) 2015 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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es6id: 22.1.3.1
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description: >
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The `Symbol.isConcatSpreadable` property is defined and coerces to `true`
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info: >
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1. Let O be ToObject(this value).
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2. ReturnIfAbrupt(O).
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3. Let A be ArraySpeciesCreate(O, 0).
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4. ReturnIfAbrupt(A).
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5. Let n be 0.
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6. Let items be a List whose first element is O and whose subsequent
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elements are, in left to right order, the arguments that were passed to
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this function invocation.
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7. Repeat, while items is not empty
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a. Remove the first element from items and let E be the value of the element.
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b. Let spreadable be IsConcatSpreadable(E).
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c. ReturnIfAbrupt(spreadable).
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d. If spreadable is true, then
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[...]
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ES6 22.1.3.1.1: Runtime Semantics: IsConcatSpreadable ( O )
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1. If Type(O) is not Object, return false.
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2. Let spreadable be Get(O, @@isConcatSpreadable).
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3. ReturnIfAbrupt(spreadable).
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4. If spreadable is not undefined, return ToBoolean(spreadable).
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features: [Symbol, Symbol.isConcatSpreadable]
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---*/
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var item = {};
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var result;
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item[Symbol.isConcatSpreadable] = true;
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result = [].concat(item);
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assert.sameValue(result.length, 0);
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item[Symbol.isConcatSpreadable] = 86;
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result = [].concat(item);
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assert.sameValue(result.length, 0);
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item[Symbol.isConcatSpreadable] = 'string';
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result = [].concat(item);
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assert.sameValue(result.length, 0);
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item[Symbol.isConcatSpreadable] = Symbol();
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result = [].concat(item);
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assert.sameValue(result.length, 0);
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item[Symbol.isConcatSpreadable] = {};
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result = [].concat(item);
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assert.sameValue(result.length, 0);
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// Copyright (C) 2015 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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es6id: 22.1.3.1
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description: >
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The `Symbol.isConcatSpreadable` property is defined as the value `undefined`
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info: >
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1. Let O be ToObject(this value).
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2. ReturnIfAbrupt(O).
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3. Let A be ArraySpeciesCreate(O, 0).
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4. ReturnIfAbrupt(A).
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5. Let n be 0.
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6. Let items be a List whose first element is O and whose subsequent
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elements are, in left to right order, the arguments that were passed to
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this function invocation.
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7. Repeat, while items is not empty
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a. Remove the first element from items and let E be the value of the element.
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b. Let spreadable be IsConcatSpreadable(E).
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c. ReturnIfAbrupt(spreadable).
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d. If spreadable is true, then
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[...]
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e. Else E is added as a single item rather than spread,
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[...]
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ES6 22.1.3.1.1: Runtime Semantics: IsConcatSpreadable ( O )
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1. If Type(O) is not Object, return false.
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2. Let spreadable be Get(O, @@isConcatSpreadable).
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3. ReturnIfAbrupt(spreadable).
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4. If spreadable is not undefined, return ToBoolean(spreadable).
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5. Return IsArray(O).
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features: [Symbol.isConcatSpreadable]
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---*/
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var item = [];
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var result;
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item[Symbol.isConcatSpreadable] = undefined;
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result = [].concat(item);
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assert.sameValue(result.length, 0);
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// Copyright (C) 2015 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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es6id: 19.4.2.3
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description: Property descriptor
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info: >
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This property has the attributes { [[Writable]]: false, [[Enumerable]]:
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false, [[Configurable]]: false }.
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includes: [propertyHelper.js]
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features: [Symbol.isConcatSpreadable]
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---*/
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assert.sameValue(typeof Symbol.isConcatSpreadable, 'symbol');
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verifyNotEnumerable(Symbol, 'isConcatSpreadable');
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verifyNotWritable(Symbol, 'isConcatSpreadable');
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verifyNotConfigurable(Symbol, 'isConcatSpreadable');
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