throttle/debounce javascript

debounce.js

// call after last delay
function debounce(callback, delay) {
  var timeout;
  return function () {
    var self = this, args = arguments;
    if (timeout) clearTimeout(timeout);
    timeout = setTimeout(function () {
      callback.apply(self, args);
    }, delay || 100);
  };
}

index.js

module.exports = {
  throttle: function (callback, delay) {
    var timeout;
    return function () {
      if (timeout) return;
      timeout = setTimeout(function () {
        timeout = false;
      }, delay || 100);
      callback.apply(this, arguments);
    };
  },
  debounce: function (callback, delay) {
    var timeout, self, args;
    return function () {
      self = this;
      args = arguments;
      if (timeout) clearTimeout(timeout);
      timeout = setTimeout(function () {
        callback.apply(self, args);
      }, delay || 100);
    };
  }
}

throttle.js

// call before each delay
function throttle(callback, delay) {
  var timeout;
  return function () {
    if (timeout) return;
    timeout = setTimeout(function () {
      timeout = false;
    }, delay || 100);
    callback.apply(this, arguments);
  };
}