materialize-stepper/src/js/polyfills.js

A little plugin, inspired by MDL-Stepper, that implements a stepper to Materializecss framework.

if (window.Element && !Element.prototype.closest) {
   Element.prototype.closest =
      function (s) {
         var matches = (this.document || this.ownerDocument).querySelectorAll(s),
            i,
            el = this;
         do {
            i = matches.length;
            while (--i >= 0 && matches.item(i) !== el) { };
         } while ((i < 0) && (el = el.parentElement));
         return el;
      };
}

// Polyfill by mozilla
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
if (typeof Object.assign != 'function') {
  // Must be writable: true, enumerable: false, configurable: true
  Object.defineProperty(Object, "assign", {
    value: function assign(target, varArgs) { // .length of function is 2
      'use strict';
      if (target == null) { // TypeError if undefined or null
        throw new TypeError('Cannot convert undefined or null to object');
      }

      var to = Object(target);

      for (var index = 1; index < arguments.length; index++) {
        var nextSource = arguments[index];

        if (nextSource != null) { // Skip over if undefined or null
          for (var nextKey in nextSource) {
            // Avoid bugs when hasOwnProperty is shadowed
            if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
              to[nextKey] = nextSource[nextKey];
            }
          }
        }
      }
      return to;
    },
    writable: true,
    configurable: true
  });
}