61 lines
1.7 KiB
JavaScript
61 lines
1.7 KiB
JavaScript
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var bindCallback = require('../internal/bindCallback');
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/* Native method references for those with the same name as other `lodash` methods. */
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var nativeFloor = Math.floor,
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nativeIsFinite = global.isFinite,
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nativeMin = Math.min;
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/** Used as references for the maximum length and index of an array. */
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var MAX_ARRAY_LENGTH = 4294967295;
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/**
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* Invokes the iteratee function `n` times, returning an array of the results
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* of each invocation. The `iteratee` is bound to `thisArg` and invoked with
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* one argument; (index).
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*
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* @static
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* @memberOf _
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* @category Utility
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* @param {number} n The number of times to invoke `iteratee`.
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* @param {Function} [iteratee=_.identity] The function invoked per iteration.
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* @param {*} [thisArg] The `this` binding of `iteratee`.
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* @returns {Array} Returns the array of results.
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* @example
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*
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* var diceRolls = _.times(3, _.partial(_.random, 1, 6, false));
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* // => [3, 6, 4]
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*
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* _.times(3, function(n) {
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* mage.castSpell(n);
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* });
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* // => invokes `mage.castSpell(n)` three times with `n` of `0`, `1`, and `2`
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*
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* _.times(3, function(n) {
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* this.cast(n);
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* }, mage);
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* // => also invokes `mage.castSpell(n)` three times
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*/
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function times(n, iteratee, thisArg) {
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n = nativeFloor(n);
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// Exit early to avoid a JSC JIT bug in Safari 8
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// where `Array(0)` is treated as `Array(1)`.
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if (n < 1 || !nativeIsFinite(n)) {
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return [];
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}
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var index = -1,
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result = Array(nativeMin(n, MAX_ARRAY_LENGTH));
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iteratee = bindCallback(iteratee, thisArg, 1);
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while (++index < n) {
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if (index < MAX_ARRAY_LENGTH) {
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result[index] = iteratee(index);
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} else {
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iteratee(index);
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}
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}
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return result;
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}
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module.exports = times;
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