Check if function exists, through the console.

check-if-function-exists.js

// a loose check, to see if object exists
if (something) {
    console.log('%c something() is present! ', 'background: #bada55; color: black');
} else {
    console.log('%c something() is NOT present! ', 'background: #de1e7e; color: white');
}

// a strict check, object must be a function
if (typeof(something) === 'function') {
    console.log('%c something() is present! ', 'background: #bada55; color: black');
} else {
    console.log('%c something() is NOT present! ', 'background: #de1e7e; color: white');
}