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42 lines
1.0 KiB
42 lines
1.0 KiB
var toInteger = require('./toInteger');
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/** Error message constants. */
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var FUNC_ERROR_TEXT = 'Expected a function';
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/**
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* The opposite of `_.before`; this method creates a function that invokes
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* `func` once it's called `n` or more times.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Function
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* @param {number} n The number of calls before `func` is invoked.
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* @param {Function} func The function to restrict.
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* @returns {Function} Returns the new restricted function.
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* @example
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*
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* var saves = ['profile', 'settings'];
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*
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* var done = _.after(saves.length, function() {
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* console.log('done saving!');
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* });
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*
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* _.forEach(saves, function(type) {
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* asyncSave({ 'type': type, 'complete': done });
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* });
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* // => Logs 'done saving!' after the two async saves have completed.
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*/
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function after(n, func) {
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if (typeof func != 'function') {
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throw new TypeError(FUNC_ERROR_TEXT);
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}
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n = toInteger(n);
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return function() {
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if (--n < 1) {
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return func.apply(this, arguments);
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}
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};
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}
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module.exports = after;
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