Mike walks us through Optionals & gives us a specific code example. Plus we launch a new segment long in the making, “Mike Was Right” & it’s a doozy!

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— Show Notes: —

Optionals

Swift 4 also introduces Optionals type, which handles the absence of a value. Optionals say either “there is a value, and it equals x” or “there isn’t a value at all”.

An Optional is a type on its own, actually one of Swift 4’s new super-powered enums. It has two possible values, None and Some(T), where T is an associated value of the correct data type available in Swift 4.

  • Gist
  • What are they and why you should use them
  • How they are used in Swift
    • String v String? – different types
    • Sort of an implicit nil check
  • What is “forced unwrapping”

  • Optional Binding

  • Optional Chaining

‘Optionals’ in other languages

After the end of the startup era

The web boom of ~1997-2006 brought us Amazon, Facebook, Google, Salesforce, Airbnb, etc., because the Internet was the new new thing, and a handful of kids in garages and dorm rooms could build a web site, raise a few million dollars, and scale to serve the whole world. The smartphone boom of ~2007-2016 brought us Uber, Lyft, Snap, WhatsApp, Instagram, Twitter, etc., because the same was true of smartphone apps.

Do you have the Learners Syndrome?

If I start building something and investing time in it, I feel like I’m missing out on learning the new cool technologies and have a fear of being left behind.

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