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Difference Between If Let And Guard Let?

Ans : 

Basic Difference :

Guard let 

Early exist process from the scope
Require score existing like return, Throw etc.
Create a new variable those can be access out the scope.

if let 

Can not access out the scope.
no need to return statement. But we can write

Note : Both are used to unwrapped the Optional variable.


Guard let


  • A guard statement is used to transfer program control out of a scope if one or more conditions aren’t met. 
  • The value of any condition in a guard statement must be of type Bool or a type bridged to Bool. The condition can also be an optional binding declaration.


guard condition else { //Generally return }
func submit() {
guard let name = nameField.text else {
    show("No name to submit")
    return

}

If let
  • Also popular as optional binding 
  • For accessing optional object we use if let
if let roomCount = optionalValue {
        print("roomCount available")
} else {
       print("roomCount is nil")

}



Q. return is mandatory in guard let statement ?
A. Exit is mandatory in guard let statement. So return or throw is mandatory in guard let. Otherwise it gives compile time error.


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