Swift Interview Questions | Interview Series |
1. What is Guard statement in Swift? (Swift)
In Swift, we use the guard statement to transfer program control out of scope when certain conditions are not met.
2. What is difference between ‘if let’ and ‘guard’ in Swift? (Swift)
In if let , the defined let variables are available within the scope of that if condition but not in else condition or even below that. In guard let , the defined let variables are not available in the else condition but after that, it's available throughout till the function ends or anything.
3. What optional binding? (Swift)
Safely unwrapping the Optional chaining values to a variable called optional binding.
Optional binding is used to check whether an optional variable or constant has a non-nil value, and if so, assign that value to a temporary, non-optional variable. It stores the value that you're binding in a variable. For optional binding, we use the if let or if var keywords together.
4. What is Optional Chaining ? (Swift)
Optional chaining is a process for querying and calling properties, methods, and subscripts on an optional that might currently be nil .
5. What is Subscripts in Swift ? (Swift)
Subscripts are used to access information from a collection, sequence and a list in Classes, Structures and Enumerations without using a method.
// subscripting an array..
array = [1, 2, 3, 5, 8, 13]
print(array[0]) // prints 1
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