Managing user input

When dealing with user input, Murphy’s Law will always apply in full force: “Anything than can go wrong will go wrong”. Or as Douglas Adams would have it:

“A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools”

This is a common crux for us developers: how do we architect a completely foolproof system? There are many routes you can take to do this, but in this particular blog post, I would like to focus on a specific aspect of this: managing user inputs.

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Subscripting String Shortcuts

The use of subscripts in Swift has added a few nice features to its predecessor in Obj-C, not only for reading, but also for writing your own implementations.

If you are not familiar with subscripts, they define the logic that allows you to write shortcut accessors and setters for objects that can be understood as a collection, and are most commonly used in Arrays and Dictionaries:


var array = ["Hello", " ", "World", "!"]
array[2] //subscript returns "World"
array[2] = "Everybody" //The word "World" is now replaced with "Everybody" using a subscript

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