CODEWITHSUNDEEP
if-statementvariableskotlinoptimization
Dj Sushi
Dj Sushi

Reputation: 616

Is it possible to declare a variable inside of the "if" condition in Kotlin?

I have this line of code:

if (x * y * z > maxProduct) maxProduct = x * y * z

But my problem is that I have to write x * y * z two times when I want to use it like this. I know I could create a variable before the if statement, like this:

val product = x * y * z
if (product > maxProduct) maxProduct = product

But I don't like that I have to create a temporary variable that's used just for this expression. Is there a way to improve my code?

Upvotes: 8

Views: 11830

Answers (2)

Tenfour04
Tenfour04

Reputation: 93629

maxProduct = maxProduct.coerceAtLeast(x * y * z)

or

maxProduct = max(maxProduct, x * y * z)

More generally (for expressions that don't have a shortcut function), .let() can be used to avoid the separate variable. But when you squeeze it on one line, in my opinion it's not as easy to read:

(x * y * z).let { if (it > maxProduct) maxProduct = it }

Upvotes: 11

Sergio
Sergio

Reputation: 30655

There is no good improvement for your requirement. But if you want some functional style code without creating a new variable use something like this:

(x * y * z).takeIf { it > maxProduct }?.let { maxProduct = it }

It is less readable, so I would suggest to stick with an additional variable.

Upvotes: 8

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