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Eval()

Strings of JavaScript code can be executed by using the eval() function. For example, you can use eval() to 'convert' a normal string to a template string.

Notice the difference between a string literal and a String object here.
<!DOCTYPE html>
<html>
<body>
  <script>
    console.log(eval('3*4'));
    console.log(eval(new String('3*4')));
    eval('x=10;');
    console.log(x);
  </script>
</body>
</html>

12 String object 10