help me please with javascript bookmarklet

[dry viper]

(function(){
let name = prompt('whats ya name twin');
alert('wsp, ${name}.');
let age = prompt('what age r u? ( in years )');
alert('hello, ${name}. u r ${age} years old.');
alert('sigma sigma boy, bye')
})();

[fallow apex]

Should be backticks not single quotes