mirror of https://github.com/tc39/test262.git
51 lines
1.1 KiB
JavaScript
51 lines
1.1 KiB
JavaScript
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// Copyright 2019 Google, 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: prod-OptionalExpression
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description: >
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various optional chain expansions
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info: |
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OptionalChain[Yield, Await]:
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?.[Expression]
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?.IdentifierName
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?.Arguments
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?.TemplateLiteral
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OptionalChain [Expression]
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OptionalChain .IdentifierName
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OptionalChain Arguments[?Yield, ?Await]
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OptionalChain TemplateLiteral
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features: [optional-chaining]
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---*/
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const arr = [10, 11];
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const obj = {
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a: 'hello',
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b: {val: 13},
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c(arg1) {
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return arg1 * 2;
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},
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arr: [11, 12]
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};
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const i = 0;
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// OptionalChain: ?.[Expression]
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assert.sameValue(11, arr?.[i + 1]);
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// OptionalChain: ?.IdentifierName
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assert.sameValue('hello', obj?.a);
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// OptionalChain: ?.Arguments
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const fn = (arg1, arg2) => {
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return arg1 + arg2;
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}
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assert.sameValue(30, fn?.(10, 20));
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// OptionalChain: OptionalChain [Expression]
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assert.sameValue(12, obj?.arr[i + 1]);
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// OptionalChain: OptionalChain .IdentifierName
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assert.sameValue(13, obj?.b.val);
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// OptionalChain: OptionalChain Arguments
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assert.sameValue(20, obj?.c(10));
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