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The increment/decrement operator evaluates its operand expression once. When the operand expression is a property accessor, RequireObjectCoercible and ToPropertyKey are called on the property accessor in the correct order.
23 lines
562 B
JavaScript
Executable File
23 lines
562 B
JavaScript
Executable File
// Copyright (C) 2015 André Bargull. 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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info: Operator x++ evaluates its reference expression once.
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description: >
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The operand expression is evaluated exactly once. Operand expression is
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MemberExpression: base[prop]. ToPropertyKey(prop) is not called multiple
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times.
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---*/
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var propKeyEvaluated = false;
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var base = {};
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var prop = {
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toString: function() {
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assert(!propKeyEvaluated);
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propKeyEvaluated = true;
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return 1;
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}
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};
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base[prop]++;
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