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21 lines
523 B
JavaScript
21 lines
523 B
JavaScript
// 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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optional chain bracket notation containing optional expresion
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info: |
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OptionalChain:
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?. [OptionalExpression]
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features: [optional-chaining]
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---*/
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const a = undefined;
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const b = {e: 0};
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const c = {};
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c[undefined] = 11;
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const d = [22];
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assert.sameValue(undefined, a?.[a?.b]);
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assert.sameValue(11, c?.[a?.b]);
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assert.sameValue(22, d?.[b?.e]);
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