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open in
main.js
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console.log(typeof("Hello"));
console.log(typeof(1));
console.log(typeof(true));

var a;
var b = "World";
var c = null;
console.log(typeof(a));
console.log(typeof(b));
console.log(typeof(c));

console.log(typeof(function x(){return "ok"}));
console.log(typeof([1,2]));
console.log(typeof({'language':'JavaScript'}));
console.log(typeof(new Date()));
console.log(typeof(null));
Native Browser JavaScript