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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.
RESETRUNFULL
<!DOCTYPE html><html><body><script>

<!DOCTYPE html><html><body><script>
   console.log(eval('3*4')); // 12
   console.log(eval(new String('3*4')));  // String object
   eval('x=10;');
   console.log(x); // 10;</script></body></html>

</script></body><html>