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/** * Returns a function, that, as long as it continues to be invoked, will not * be triggered. The function will be called after it stops being called for * N milliseconds. If `immediate` is passed, trigger the function on the * leading edge, instead of the trailing. The function also has a property 'clear' * that is a function which will clear the timer to prevent previously scheduled executions. * * @source underscore.js * @see http://unscriptable.com/2009/03/20/debouncing-javascript-methods/ * @param {Function} function to wrap * @param {Number} timeout in ms (`100`) * @param {Boolean} whether to execute at the beginning (`false`) * @api public */ function debounce(func, wait, immediate){ var timeout, args, context, timestamp, result; if (null == wait) wait = 100; function later() { var last = Date.now() - timestamp; if (last < wait && last >= 0) { timeout = setTimeout(later, wait - last); } else { timeout = null; if (!immediate) { result = func.apply(context, args); context = args = null; } } }; var debounced = function(){ context = this; args = arguments; timestamp = Date.now(); var callNow = immediate && !timeout; if (!timeout) timeout = setTimeout(later, wait); if (callNow) { result = func.apply(context, args); context = args = null; } return result; }; debounced.clear = function() { if (timeout) { clearTimeout(timeout); timeout = null; } }; debounced.flush = function() { if (timeout) { result = func.apply(context, args); context = args = null; clearTimeout(timeout); timeout = null; } }; return debounced; }; // Adds compatibility for ES modules debounce.debounce = debounce; module.exports = debounce;