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* Add test verifying that optional call preserves `this`. * Update test/language/expressions/optional-chaining/optional-call-preserves-this.js Co-Authored-By: Leo Balter <leonardo.balter@gmail.com>
28 lines
806 B
JavaScript
28 lines
806 B
JavaScript
// Copyright (C) 2019 Sony Interactive Entertainment Inc. 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-optional-chaining-chain-evaluation
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description: >
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optional call must preserve this context, as with a non-optional call
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info: |
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OptionalChain : ?. Arguments
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1. Let thisChain be this OptionalChain.
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2. Let tailCall be IsInTailPosition(thisChain).
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3. Return ? EvaluateCall(baseValue, baseReference, Arguments, tailCall).
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features: [optional-chaining]
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---*/
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const a = {
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b() { return this._b; },
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_b: { c: 42 }
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};
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assert.sameValue(a?.b().c, 42);
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assert.sameValue((a?.b)().c, 42);
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assert.sameValue(a.b?.().c, 42);
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assert.sameValue((a.b)?.().c, 42);
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assert.sameValue(a?.b?.().c, 42);
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assert.sameValue((a?.b)?.().c, 42);
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