i am doing a bunch of: ```val value = if (someCondition) { // compute value } else { null }``` t...

# getting-started

[poohbar]

i am doing a bunch of:

val value = if (someCondition) {
  // compute value
} else {
  null
}

the else branch is always just null.. is there a more idiomatic way to write this?

[poohbar]

someCondition is not a null check otherwise i would use let

[Joffrey]

If the computation is not expensive you could use:

val value = computeValue().takeIf { someCondition }

[poohbar]

thought of that.. only problem is that computeValue() actually blows up if someCondition == false

[ephemient]

if it takes a non-null argument then

val value = arg.takeIf { someCondition }?.let { computeValue(it) }

[ephemient]

but there's nothing as clear as the if statement

[Joffrey]

I was about to write just that ☝️

[Joffrey]

If the computation and/or the condition are complex expressions, extract them into a function, and then keep the if statement:

val value = if (condition) computeValue() else null

[ephemient]

https://kotlinlang.slack.com/archives/C0B8MA7FA/p1644055755174919?thread_ts=1644007194.532909&cid=C0B8MA7FA

[poohbar]

im looking for something like this i guess:

private fun <T> getIf(condition: Boolean, supplier: () -> T?): T? {
    return if (condition) {
        supplier()
    } else {
        null
    }
}

[poohbar]

oh yeah, that’s exactly what i need.. cool.. dont care about smart casting so i will implement my own for now