[Vuejs]-Delay slick slider until get response from calling API

just check the variable(which you assigning after getting a response) is null or not null

eg:

 applySlider() {
             if(this.products){
                if (this.products.length >= 1) {
                    $(".regular").slick({
                        //dots: true,
                        infinite: true,
                        slidesToShow: 4,
                        slidesToScroll: 4,
                        responsive: [
                            {
                            breakpoint: 992,
                            settings: {
                                slidesToShow: 3,
                                slidesToScroll: 3,
                                infinite: true,
                                dots: true,
                                arrows:false,
                            }
                            },
                            {
                            breakpoint: 768,
                            settings: {
                                slidesToShow: 2,
                                slidesToScroll: 2,
                                arrows:false,
                            }
                            },
                            {
                            breakpoint: 480,
                            settings: {
                                slidesToShow: 2,
                                slidesToScroll: 2,
                                arrows:false,
                            }
                            }
                        ]
                    });
                } 
            }
         }