difference between Function and new Function

Question

I sometimes see people doing this Function('alert("hi")') and sometimes they do new Function('alert("hi")')

Is there a difference between the two?

Answer 1

The spec (page 127) says they're identical.

15.3.1.1 Function (p1, p2, … , pn, body)

When the Function function is called with some arguments p1, p2, … , pn, body (where n might be 0, that is, there are no “p” arguments, and where body might also not be provided), the following steps are taken:

1. Create and return a new Function object as if the standard built-in constructor Function was used in a new expression with the same arguments (15.3.2.1).

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However, you should avoid the Function constructor at all costs.
It needs to eval the string you pass to it; eval is evil, and slow too.