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View File Name : debounce.js

var restArguments = require('./restArguments.js');
var now = require('./now.js');

// When a sequence of calls of the returned function ends, the argument
// function is triggered. The end of a sequence is defined by the `wait`
// parameter. If `immediate` is passed, the argument function will be
// triggered at the beginning of the sequence instead of at the end.
function debounce(func, wait, immediate) {
  var timeout, previous, args, result, context;

  var later = function() {
    var passed = now() - previous;
    if (wait > passed) {
      timeout = setTimeout(later, wait - passed);
    } else {
      timeout = null;
      if (!immediate) result = func.apply(context, args);
      // This check is needed because `func` can recursively invoke `debounced`.
      if (!timeout) args = context = null;
    }
  };

  var debounced = restArguments(function(_args) {
    context = this;
    args = _args;
    previous = now();
    if (!timeout) {
      timeout = setTimeout(later, wait);
      if (immediate) result = func.apply(context, args);
    }
    return result;
  });

  debounced.cancel = function() {
    clearTimeout(timeout);
    timeout = args = context = null;
  };

  return debounced;
}

module.exports = debounce;