uniqBy.js (1013B)
1 var baseIteratee = require('./_baseIteratee'), 2 baseUniq = require('./_baseUniq'); 3 4 /** 5 * This method is like `_.uniq` except that it accepts `iteratee` which is 6 * invoked for each element in `array` to generate the criterion by which 7 * uniqueness is computed. The order of result values is determined by the 8 * order they occur in the array. The iteratee is invoked with one argument: 9 * (value). 10 * 11 * @static 12 * @memberOf _ 13 * @since 4.0.0 14 * @category Array 15 * @param {Array} array The array to inspect. 16 * @param {Function} [iteratee=_.identity] The iteratee invoked per element. 17 * @returns {Array} Returns the new duplicate free array. 18 * @example 19 * 20 * _.uniqBy([2.1, 1.2, 2.3], Math.floor); 21 * // => [2.1, 1.2] 22 * 23 * // The `_.property` iteratee shorthand. 24 * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x'); 25 * // => [{ 'x': 1 }, { 'x': 2 }] 26 */ 27 function uniqBy(array, iteratee) { 28 return (array && array.length) ? baseUniq(array, baseIteratee(iteratee, 2)) : []; 29 } 30 31 module.exports = uniqBy;