Is it better to declare a variable inside or outside a loop?

Question

Is better do:

variable1Type foo; 
variable2Type baa; 

foreach(var val in list) 
{
    foo = new Foo( ... ); 
    foo.x = FormatValue(val); 

    baa = new B         


        

Answer 1

It's just a matter of scope. In this case, where foo and baa are only used within the for loop, it's best practice to declare them inside the loop. It's safer too.