times.js (1367B)
1 var baseTimes = require('./_baseTimes'), 2 castFunction = require('./_castFunction'), 3 toInteger = require('./toInteger'); 4 5 /** Used as references for various `Number` constants. */ 6 var MAX_SAFE_INTEGER = 9007199254740991; 7 8 /** Used as references for the maximum length and index of an array. */ 9 var MAX_ARRAY_LENGTH = 4294967295; 10 11 /* Built-in method references for those with the same name as other `lodash` methods. */ 12 var nativeMin = Math.min; 13 14 /** 15 * Invokes the iteratee `n` times, returning an array of the results of 16 * each invocation. The iteratee is invoked with one argument; (index). 17 * 18 * @static 19 * @since 0.1.0 20 * @memberOf _ 21 * @category Util 22 * @param {number} n The number of times to invoke `iteratee`. 23 * @param {Function} [iteratee=_.identity] The function invoked per iteration. 24 * @returns {Array} Returns the array of results. 25 * @example 26 * 27 * _.times(3, String); 28 * // => ['0', '1', '2'] 29 * 30 * _.times(4, _.constant(0)); 31 * // => [0, 0, 0, 0] 32 */ 33 function times(n, iteratee) { 34 n = toInteger(n); 35 if (n < 1 || n > MAX_SAFE_INTEGER) { 36 return []; 37 } 38 var index = MAX_ARRAY_LENGTH, 39 length = nativeMin(n, MAX_ARRAY_LENGTH); 40 41 iteratee = castFunction(iteratee); 42 n -= MAX_ARRAY_LENGTH; 43 44 var result = baseTimes(length, iteratee); 45 while (++index < n) { 46 iteratee(index); 47 } 48 return result; 49 } 50 51 module.exports = times;