[javascript] Keylistener in Javascript

A bit more readable comparing is done by casting event.key to upper case (I used onkeyup - needed the event to fire once upon each key tap):

window.onkeyup = function(event) {
    let key = event.key.toUpperCase();
    if ( key == 'W' ) {
        // 'W' key is pressed
    } else if ( key == 'D' ) {
        // 'D' key is pressed
    }
}

Each key has it's own code, get it out by outputting value of "key" variable (eg for arrow up key it will be 'ARROWUP' - (casted to uppercase))

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