JAVASCRIPT

check if a class exists javascript

const element = document.querySelector("#box");

element.classList.contains("active");

js class exists

var isMobileVersion = document.getElementsByClassName('snake--mobile');
if (isMobileVersion.length > 0) {
    // elements with class "snake--mobile" exist
}

class exists javascript

            
                
            
         const div = document.querySelector('.info');
div.classList.contains('secondary'); // trueCode language: JavaScript (javascript)

check if value is a class nodejs

export const isClass = <T>(value: unknown): value is Constructor<T> => {
	return typeof value === "function" && typeof value.prototype === "object";
};

export type Constructor<T> = new (...args: unknown[]) => T;

class exists javascript

            
                
            
         <div class="secondary info">Item</div>Code language: HTML, XML (xml)