var str = 'abc';

str = str.charAt(Math.floor(Math.random() * 3));

var num = str.charCodeAt(0)

const a = 'a'.charCodeAt(0)

const b = 'b'.charCodeAt(0)

const c = 'c'.charCodeAt(0)

function handle_switch (num) {

  switch (num) {

    case 97: console.log('A'); break;

    case 98: console.log('B'); break;

    case 99: console.log('C'); break;

  }

}

const object = {

  97: function () { console.log('A') },

  98: function () { console.log('B') },

  99: function () { console.log('C') }

}

​

function handle_object (num) { object[num]() }