Delete adverts and a header

deleteAdvertAndHeader.js

// call function from second
let timeout = 300;

/**
 * Delete adverts
 */
function removeAdvert() {
    // find a classes  advert in content
    let codeBlocks = document.getElementsByClassName('code-block');
    for (let key in codeBlocks) {
        // delete content
        if (codeBlocks[0]) {
            // check exist element
            codeBlocks[0].remove();
        } else {
            console.log("I'm not found code-block")
        }
    }
}
/**
 * Delete a header
 */
function removeHeader() {
    // find a class advert in content
    let header = document.getElementsByClassName('header-main-area');
    if (header[0]) {
        // check exist element
        header[0].remove();
    } else {
        console.log("I'm not found header-main-area")
    }

    // remote telegramm
    let block = document.getElementById('media_image-2');
    if (block) {
        // check exist element
        block.remove();
    } else {
        console.log("I'm not found media_image-2")
    }
}


//header-main-area 
setTimeout(() => {
    removeAdvert();
    removeHeader();
}, timeout);