ts_temp/object/pickBy.js

import curryN from '../function/curryN';
/**
 * Returns a partial copy of an object containing only the keys with `fn` predicate returns true
 *
 * @param {Function} fn predicate to pick keys. Receives three argument, `value`, `key`, `obj`.
 * @param {Object} obj The object to copy from
 * @return {Object} A new object with only properties from `names` on it.
 * @example
 *
 *      pickBy(x => x > 2, {a: 1, b: 2, c: 3, d: 4}); //=> {c: 3, d: 4}
 */
export default curryN(2, (fn, obj = {}) => {
    const result = {};
    for (const prop in obj) {
        if (fn(obj[prop], prop, obj)) {
            result[prop] = obj[prop];
        }
    }
    return result;
});