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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' ]); ```
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