README.md
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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' ]);
	```