mirror of https://github.com/tc39/test262.git
73 lines
1.9 KiB
JavaScript
73 lines
1.9 KiB
JavaScript
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// Copyright (C) 2020 Alexey Shvayka. 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-function-definitions-runtime-semantics-instantiatefunctionobject
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description: >
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Initializer is not evaluated when argument is an object with
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[[IsHTMLDDA]] internal slot.
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info: |
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FunctionDeclaration :
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function BindingIdentifier ( FormalParameters ) { FunctionBody }
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[...]
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3. Let F be FunctionCreate(Normal, FormalParameters, FunctionBody,
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scope, strict).
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[...]
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[[Call]] ( thisArgument, argumentsList)
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[...]
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7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
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[...]
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OrdinaryCallEvaluateBody ( F, argumentsList )
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1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
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[...]
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FunctionDeclarationInstantiation(func, argumentsList)
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[...]
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23. Let iteratorRecord be Record {[[iterator]]:
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CreateListIterator(argumentsList), [[done]]: false}.
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24. If hasDuplicates is true, then
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[...]
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25. Else,
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b. Let formalStatus be IteratorBindingInitialization for formals with
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iteratorRecord and env as arguments.
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[...]
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Runtime Semantics: IteratorBindingInitialization
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FormalsList : FormalsList , FormalParameter
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[...]
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23. Let iteratorRecord be Record {[[Iterator]]:
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CreateListIterator(argumentsList), [[Done]]: false}.
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24. If hasDuplicates is true, then
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[...]
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25. Else,
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a. Perform ? IteratorBindingInitialization for formals with
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iteratorRecord and env as arguments.
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[...]
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features: [default-parameters, IsHTMLDDA]
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---*/
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let initCount = 0;
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const counter = function() {
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initCount += 1;
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};
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const arrow = (x = counter()) => x;
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const IsHTMLDDA = $262.IsHTMLDDA;
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assert.sameValue(arrow(IsHTMLDDA), IsHTMLDDA);
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assert.sameValue(initCount, 0);
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function fn(x, y = counter()) {
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return y;
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}
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assert.sameValue(fn(1, IsHTMLDDA), IsHTMLDDA);
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assert.sameValue(initCount, 0);
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