basant307/AI_Governance_Project

1var debounce = require('./debounce'),2    isObject = require('./isObject');3 4/** Error message constants. */5var FUNC_ERROR_TEXT = 'Expected a function';6 7/**8 * Creates a throttled function that only invokes `func` at most once per9 * every `wait` milliseconds. The throttled function comes with a `cancel`10 * method to cancel delayed `func` invocations and a `flush` method to11 * immediately invoke them. Provide `options` to indicate whether `func`12 * should be invoked on the leading and/or trailing edge of the `wait`13 * timeout. The `func` is invoked with the last arguments provided to the14 * throttled function. Subsequent calls to the throttled function return the15 * result of the last `func` invocation.16 *17 * **Note:** If `leading` and `trailing` options are `true`, `func` is18 * invoked on the trailing edge of the timeout only if the throttled function19 * is invoked more than once during the `wait` timeout.20 *21 * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred22 * until to the next tick, similar to `setTimeout` with a timeout of `0`.23 *24 * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)25 * for details over the differences between `_.throttle` and `_.debounce`.26 *27 * @static28 * @memberOf _29 * @since 0.1.030 * @category Function31 * @param {Function} func The function to throttle.32 * @param {number} [wait=0] The number of milliseconds to throttle invocations to.33 * @param {Object} [options={}] The options object.34 * @param {boolean} [options.leading=true]35 *  Specify invoking on the leading edge of the timeout.36 * @param {boolean} [options.trailing=true]37 *  Specify invoking on the trailing edge of the timeout.38 * @returns {Function} Returns the new throttled function.39 * @example40 *41 * // Avoid excessively updating the position while scrolling.42 * jQuery(window).on('scroll', _.throttle(updatePosition, 100));43 *44 * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.45 * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });46 * jQuery(element).on('click', throttled);47 *48 * // Cancel the trailing throttled invocation.49 * jQuery(window).on('popstate', throttled.cancel);50 */51function throttle(func, wait, options) {52  var leading = true,53      trailing = true;54 55  if (typeof func != 'function') {56    throw new TypeError(FUNC_ERROR_TEXT);57  }58  if (isObject(options)) {59    leading = 'leading' in options ? !!options.leading : leading;60    trailing = 'trailing' in options ? !!options.trailing : trailing;61  }62  return debounce(func, wait, {63    'leading': leading,64    'maxWait': wait,65    'trailing': trailing66  });67}68 69module.exports = throttle;70