mirror of https://github.com/tc39/test262.git
60 lines
1.8 KiB
JavaScript
60 lines
1.8 KiB
JavaScript
// Copyright (C) 2016 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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esid: sec-addition-operator-plus-runtime-semantics-evaluation
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es6id: 12.7.3.1
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description: Invocation of `Symbol.toPrimitive` method during coercion
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info: |
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[...]
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5. Let lprim be ? ToPrimitive(lval).
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6. Let rprim be ? ToPrimitive(rval).
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[...]
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ES6 Section 7.2.12 Abstract Equality Comparison
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[...]
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10. If Type(x) is either String, Number, or Symbol and Type(y) is Object,
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then return the result of the comparison x == ToPrimitive(y).
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ES6 Section 7.1.1 ToPrimitive ( input [, PreferredType] )
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1. If PreferredType was not passed, let hint be "default".
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[...]
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4. Let exoticToPrim be GetMethod(input, @@toPrimitive).
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5. ReturnIfAbrupt(exoticToPrim).
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6. If exoticToPrim is not undefined, then
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a. Let result be Call(exoticToPrim, input, «hint»).
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[...]
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features: [Symbol.toPrimitive]
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---*/
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var left = {};
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var right = {};
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var log = '';
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var leftThisVal, rightThisVal, leftArgs, rightArgs;
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left[Symbol.toPrimitive] = function() {
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log += 'left';
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leftThisVal = this;
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leftArgs = arguments;
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};
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right[Symbol.toPrimitive] = function() {
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log += 'right';
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rightThisVal = this;
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rightArgs = arguments;
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};
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left + right;
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assert.sameValue(log, 'leftright', 'methods invoked in correct sequence');
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assert.sameValue(leftThisVal, left, 'left-hand side `this` value');
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assert.sameValue(leftArgs.length, 1, 'left-hand side argument length');
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assert.sameValue(leftArgs[0], 'default', 'left-hand side argument value');
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assert.sameValue(rightThisVal, right, 'right-hand side `this` value');
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assert.sameValue(rightArgs.length, 1, 'right-hand side argument length');
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assert.sameValue(rightArgs[0], 'default', 'right-hand side argument value');
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