CODEWITHSUNDEEP
swift
ncu
ncu

Reputation: 71

swift programming syntax issue

What does it mean in swift when there is a period bewteen two variables and/or functions. I know it's very simple but I can't find an answer and it's driving me crazy. An example program is below:

 “let string1 = "hello"
 let string2 = " there"
 var welcome = string1 + string2
 // welcome now equals "hello there”


 let exclamationMark: Character = "!"
 welcome.append(exclamationMark)
 // welcome now equals "hello there!”

Excerpt From: Apple Inc. “The Swift Programming Language.” iBooks. https://itun.es/ca/jEUH0.l

What's the use of the period between welcome and append? What does it do?

Upvotes: 1

Views: 62

Answers (2)

Don Alejandro
Don Alejandro

Reputation: 885

It's called "dot syntax" and that's what is used to access members, functions or properties of that instance.

Upvotes: 0

nachodev
nachodev

Reputation: 96

That's how you call function "append" for instance "welcome", passing "exclamationMark" as the parameter. In Objective-C this would be:

[welcome append: exclamationMark];

In general, the period is how you access any member (method or property) of an instance.

Upvotes: 1

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