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https://github.com/jerryscript-project/jerryscript.git
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a7d129c8b2
Algorithm is based on ECMA-262 v6, 22.1.3.1.1 JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu
82 lines
2.4 KiB
JavaScript
82 lines
2.4 KiB
JavaScript
// Copyright JS Foundation and other contributors, http://js.foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Test with regular arrays
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var alpha = ['a', 'b', 'c'];
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var numeric = [1, 2, 3];
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var alphaNumeric = alpha.concat(numeric);
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assert(JSON.stringify(alphaNumeric) === '["a","b","c",1,2,3]');
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assert(alphaNumeric.length === 6);
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numeric[Symbol.isConcatSpreadable] = false;
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alphaNumeric = alpha.concat(numeric);
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assert(JSON.stringify(alphaNumeric) === '["a","b","c",[1,2,3]]');
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assert(alphaNumeric.length === 4);
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numeric[Symbol.isConcatSpreadable] = true;
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// Test with array-like object
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var fakeArray = {
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[Symbol.isConcatSpreadable]: true,
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length: 2,
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0: 4,
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1: 5
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}
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var numericArray = numeric.concat(fakeArray);
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assert(JSON.stringify(numericArray) === '[1,2,3,4,5]');
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assert(numericArray.length === 5);
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fakeArray[Symbol.isConcatSpreadable] = false;
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numericArray = numeric.concat(fakeArray);
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assert(JSON.stringify(numericArray) === '[1,2,3,{"0":4,"1":5,"length":2}]');
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assert(numericArray.length === 4);
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// Test with object
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var obj = { 0: 'd' };
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var alphaObj = alpha.concat(obj);
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assert(JSON.stringify(alphaObj) === '["a","b","c",{"0":"d"}]');
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assert(alphaObj.length === 4);
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obj[Symbol.isConcatSpreadable] = true;
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alphaObj = alpha.concat(obj);
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assert(JSON.stringify(alphaObj) === '["a","b","c"]');
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assert(alphaObj.length === 3);
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// Test with boolean
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var bool = true;
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var numericBool = numeric.concat(bool);
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assert(JSON.stringify(numericBool) === '[1,2,3,true]');
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assert(numericBool.length === 4);
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bool[Symbol.isConcatSpreadable] = false;
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numericBool = numeric.concat(bool);
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assert(JSON.stringify(numericBool) === '[1,2,3,true]');
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assert(numericBool.length === 4);
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// Test when unable to concat
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var array1 = [];
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var array2 = [];
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Object.defineProperty(array2, '0', { 'get' : function () {throw new ReferenceError ("foo"); } });
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try {
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array1.concat(array2);
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assert(false);
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} catch (e) {
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assert(e.message === "foo");
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assert(e instanceof ReferenceError);
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}
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