do nothing in If inside swift

Question

I am wondering inside of a if statement, can I have something like Python pass?

var num = 10
num > 5 ? doSomethingIfTrue(): doSomethingIfFalse()

The above code will be alright if both true and false methods are supplied. What if I only wanna to execute just the true method?? Such as:

num > 5 ? doSomethingIfTrue(): ***pass***

I am hoping to have something like a pass statement in swift so the program will just carry on if false is return. I have tried continue and fallthrough but I guess they are only used inside a loop statement.

Answer 1

You could, in theory, say this:

var num = 10
num > 5 ? doSomethingIfTrue() : ()

That works because () is a void statement.

But I wouldn't do that! I would write it this way:

var num = 10
if num > 5 { doSomethingIfTrue() }

Yes, it's more characters, but that's Swift; you can't omit the curly braces from an if construct. And your ternary operator was the wrong operator to start with. As someone else has pointed out, it really is most appropriate for conditional assignment and similar.

Really, it's a matter of adapting yourself to the syntax, operators, and flow control of this language. Don't to try to make Swift be like Python; it won't be.

Answer 2

The ?: conditional operator expects a value in each of its three operands, because it needs to give a value back. Say you have the hypothetical

a = b + ((c > 0) ? 1 : pass)

What would you expect the + to do if c was not positive?

For statements, use if as follows:

if num > 5 {
  doSomethingIfTrue()
}