slick js only on mobile

slick-on-mobile.js

  // slider
  $slick_slider = $('.slider');
  settings_slider = {}
  slick_on_mobile( $slick_slider, settings_slider);

  // slick on mobile
  function slick_on_mobile(slider, settings){
    var mediaQuery = window.matchMedia('(min-width: 769px)');
    mediaQuery.addListener(doSomething);
    function doSomething(mediaQuery) {
      if (mediaQuery.matches) {
        if (slider.hasClass('slick-initialized')) {
          slider.slick('unslick');
        }
        return
      }
      if (!slider.hasClass('slick-initialized')) {
        return slider.slick(settings);
      }
    }
    // On load
    doSomething(mediaQuery);
  };