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38 lines
839 B
38 lines
839 B
2 years ago
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# @jridgewell/set-array
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> Like a Set, but provides the index of the `key` in the backing array
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This is designed to allow synchronizing a second array with the contents of the backing array, like
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how in a sourcemap `sourcesContent[i]` is the source content associated with `source[i]`, and there
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are never duplicates.
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## Installation
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```sh
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npm install @jridgewell/set-array
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```
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## Usage
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```js
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import { SetArray, get, put, pop } from '@jridgewell/set-array';
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const sa = new SetArray();
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let index = put(sa, 'first');
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assert.strictEqual(index, 0);
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index = put(sa, 'second');
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assert.strictEqual(index, 1);
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assert.deepEqual(sa.array, [ 'first', 'second' ]);
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index = get(sa, 'first');
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assert.strictEqual(index, 0);
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pop(sa);
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index = get(sa, 'second');
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assert.strictEqual(index, undefined);
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assert.deepEqual(sa.array, [ 'first' ]);
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```
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