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37 lines
839 B
37 lines
839 B
# @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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