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