loading
main.js
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var letter;

console.log(letter);

function testing() {                                
  console.log(number);
  var number = 2;
  console.log(number);
}      

testing();

console.log(vowels); 
var vowels = ['a','e','i','o','u'];  
console.log(vowels);


random = 8;
console.log(random);
Native Browser JavaScript