ComputerGraphicsSpaceship/keys.js at main · KesseNones/ComputerGraphicsSpaceship · GitHub

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 class Keys{
    constructor(){
        this.keys_down = {}
    }

    static start_listenting(){
        let keys = new Keys();

        addEventListener('keydown', function(ev){
            if (typeof ev.code === 'string'){
                keys.keys_down[ev.code] = true;
            }
        })

        addEventListener('keyup', function(ev){
            if (typeof ev.code === 'string'){
                keys.keys_down[ev.code] = false;
            }
        })

        return keys;
    }

    is_key_down(code){
        return !!this.keys_down[code];
    }

    is_key_up(code){
        return !this.keys_down[code];
    }

    keys_down_list(){
        return Object.entries(this.keys_down)
            .filter(kv => kv[1])
            .map(kv => kv[0])
    }
}