how to check if checkbox is checked in js code example

Example 1: How to check whether a checkbox is checked in jQuery?

//using plane javascript 
if(document.getElementById('on_or_off_checkbox').checked) {
    //I am checked
} 

//using jQuery
if($('#on_or_off_checkbox').is(':checked')){
    //I am checked
}

Example 2: if checkbox is checked

if ($('#id_input').is(':checked')) { }

Example 3: how to check if input is checked javascript

const cb = document.getElementById('accept');
console.log(cb.checked);