source: node_modules/ramda-adjunct/es/pickIndexes.js

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Last change on this file was d24f17c, checked in by Aleksandar Panovski <apano77@…>, 15 months ago

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1import { filter, addIndex, curry, includes } from 'ramda';
2
3// helpers
4var filterIndexed = addIndex(filter);
5var containsIndex = curry(function (indexes, val, index) {
6 return includes(index, indexes);
7});
8
9/**
10 * Picks values from list by indexes.
11 *
12 * Note: pickIndexes will skip non existing indexes. If you want to include them
13 * use ramda's `props` function.
14 *
15 * @func pickIndexes
16 * @memberOf RA
17 * @since {@link https://char0n.github.io/ramda-adjunct/1.1.0|v1.1.0}
18 * @category List
19 * @sig [Number] -> [a] -> [a]
20 * @param {Array} indexes The indexes to pick
21 * @param {Array} list The list to pick values from
22 * @return {Array} New array containing only values at `indexes`
23 * @see {@link http://ramdajs.com/docs/#pick|R.pick}, {@link RA.omitIndexes|omitIndexes}
24 * @example
25 *
26 * RA.pickIndexes([0, 2], ['a', 'b', 'c']); //=> ['a', 'c']
27 */
28var pickIndexes = curry(function (indexes, list) {
29 return filterIndexed(containsIndex(indexes), list);
30});
31export default pickIndexes;
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