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x/ramda/pick.js

:ram: Practical functional Javascript
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import _curry2 from './internal/_curry2';

/** * Returns a partial copy of an object containing only the keys specified. If * the key does not exist, the property is ignored. * * @func * @memberOf R * @since v0.1.0 * @category Object * @sig [k] -> {k: v} -> {k: v} * @param {Array} names an array of String property names to copy onto a new object * @param {Object} obj The object to copy from * @return {Object} A new object with only properties from `names` on it. * @see R.omit, R.props * @example * * R.pick(['a', 'd'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1, d: 4} * R.pick(['a', 'e', 'f'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1} */var pick = _curry2(function pick(names, obj) { var result = {}; var idx = 0; while (idx < names.length) { if (names[idx] in obj) { result[names[idx]] = obj[names[idx]]; } idx += 1; } return result;});export default pick;