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56 lines
1.2 KiB
56 lines
1.2 KiB
2 years ago
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[](https://travis-ci.org/fgnass/uniqs)
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### Tiny utility to create unions and de-duplicated lists.
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Example:
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```js
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var uniqs = require('uniqs');
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var foo = { foo: 23 };
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var list = [3, 2, 2, 1, foo, foo];
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uniqs(list);
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// => [3, 2, 1, { foo: 23 }]
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```
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You can pass multiple lists to create a union:
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```js
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uniqs([2, 1, 1], [2, 3, 3, 4], [4, 3, 2]);
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// => [2, 1, 3, 4]
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```
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Passing individual items works too:
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```js
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uniqs(3, 2, 2, [1, 1, 2]);
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// => [3, 2, 1]
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```
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### Summary
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* Uniqueness is defined based on strict object equality.
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* The lists do not need to be sorted.
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* The resulting array contains the items in the order of their first appearance.
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### About
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This package has been written to accompany utilities like
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[flatten](https://npmjs.org/package/flatten) as alternative to full-blown
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libraries like underscore or lodash.
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The implementation is optimized for simplicity rather than performance and
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looks like this:
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```js
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module.exports = function uniqs() {
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var list = Array.prototype.concat.apply([], arguments);
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return list.filter(function(item, i) {
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return i == list.indexOf(item);
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});
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};
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```
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### License
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MIT
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