[JavaScript] Difference between eval() vs new Function()

Many JavaScript programmers treat eval & new Function construct as the same. But new Function & eval are NOT the same. the important difference is:-

• eval() works within the current execution scope and can affect local variables.
• new Function() cannot affect local variables because the code runs in a separate scope

So both are evil & should only be used when there is no other way but as you may notice new Function is slightly less evil

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