It’s sometimes useful to create custom operators to avoid boilerplate code. For example in the following code, we check if a variable is not nil before assigning it to our object:
if let basedOn = basedOn {
story.basedOn = basedOn
}
It would be much better if we could simplify and have this instead:
story.basedOn ?= basedOn
To do that in Swift, we can create an “Optional Assignment” custom operator, as short as ?=
here, with a few lines of code: