| 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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