Undefined is not a function

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Currently learning native JS and trying to create an interactive menu.

I'm trying to run a function once the menuBtn has been clicked but I have the following error in the console.

undefined is not a function 

is the global function the issue here?

(function () {
        'use strict';

        var menuBtn = document.getElementsByClassName('btn-nav');

        menuBtn.addEventListener('click', function() {
            console.log('clicked');
        }, false);

}());

asked 25 secs ago

user1381806

91