1 | var toInteger = require('./toInteger');
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2 |
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3 | /** Error message constants. */
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4 | var FUNC_ERROR_TEXT = 'Expected a function';
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5 |
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6 | /**
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7 | * The opposite of `_.before`; this method creates a function that invokes
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8 | * `func` once it's called `n` or more times.
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9 | *
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10 | * @static
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11 | * @memberOf _
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12 | * @since 0.1.0
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13 | * @category Function
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14 | * @param {number} n The number of calls before `func` is invoked.
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15 | * @param {Function} func The function to restrict.
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16 | * @returns {Function} Returns the new restricted function.
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17 | * @example
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18 | *
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19 | * var saves = ['profile', 'settings'];
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20 | *
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21 | * var done = _.after(saves.length, function() {
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22 | * console.log('done saving!');
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23 | * });
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24 | *
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25 | * _.forEach(saves, function(type) {
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26 | * asyncSave({ 'type': type, 'complete': done });
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27 | * });
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28 | * // => Logs 'done saving!' after the two async saves have completed.
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29 | */
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30 | function after(n, func) {
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31 | if (typeof func != 'function') {
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32 | throw new TypeError(FUNC_ERROR_TEXT);
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33 | }
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34 | n = toInteger(n);
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35 | return function() {
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36 | if (--n < 1) {
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37 | return func.apply(this, arguments);
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38 | }
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39 | };
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40 | }
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41 |
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42 | module.exports = after;
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