cytoscape-expand-collapse/src/debounce2.js

This extension provides an interface to expand-collapse nodes.

var debounce2 = (function () {
  /**
   * Slightly modified version of debounce. Calls fn2 at the beginning of frequent calls to fn1
   * @static
   * @category Function
   * @param {Function} fn1 The function to debounce.
   * @param {number} [wait=0] The number of milliseconds to delay.
   * @param {Function} fn2 The function to call the beginning of frequent calls to fn1
   * @returns {Function} Returns the new debounced function.
   */
  function debounce2(fn1, wait, fn2) {
    let timeout;
    let isInit = true;
    return function () {
      const context = this, args = arguments;
      const later = function () {
        timeout = null;
        fn1.apply(context, args);
        isInit = true;
      };
      clearTimeout(timeout);
      timeout = setTimeout(later, wait);
      if (isInit) {
        fn2.apply(context, args);
        isInit = false;
      }
    };
  }
  return debounce2;
})();

module.exports = debounce2;