✅ What is difference between = and :=

:= is for both declaration, assignment, and also for redeclaration.

ex) foo := 32 is a shor-hand form of

• 	```
  	var foo int 
  	foo = 32
  	```

• var foo int = 32

• var foo = 32

✅ Rules!

• cannot ues := out of functions
• cannot use them twice in the same scope
• can use them for multi-variable declarations and assignments foo, bar := 42, 314
• can use the shor decalaration to declared with the same name before var foo int = 34