Ray Wenderlich Functions and Types Course - Part 4
Wanted to code at the weekend but had literally no time to! So a quick 20 minutes now, if that! Start Time - 17:38 Two more handy methods - compact map and flat map! Compact Map and Flat Map Compact - helps us deal with optionals. Iterates through each element then add resulting values if they are non nil. Flat - multi dimensional array - combine arrays into 1! This is how you would use a for loop to go through an array and convert what you can to an int - var arrayForValidInput : [ Int ] = [] for input in userInput { guard let input = Int (input) else { continue } arrayForValidInput . append (input) } But of course compact map is much better! let validInput = userInput . compactMap { (input) in Int (input) } Flat Map let arrayOfDwarfArrays = [ [ "Sleepy" , "Grumpy" , "Doc" , "Bashful" , "Sneezy" ], [ "Thorin" ,...
