You can book on-site classes at your company or organization, e.g.
Instead, we can turn our validator into a more powerful one by making it a factory which returns a callable: function as a closure, which is used in the field’s validation chain.
This tutorial was updated to i OS 8 and Swift by James Frost.
Original post by Tutorial Team member Soheil Azarpour.
.) Furthermore, if the data is a string type, a string containing only whitespace characters is considered false.
If the data is empty, also removes prior errors (such as processing errors) from the field.