Exactly when I tough i was getting pro at kotlin I fall on t

Question

Exactly when I tough i was getting pro at kotlin I fall on the most basic thing this code below do not compile slightly smiling face I know about ranges I can do `in Int MIN VALUE until 0` I also know I can save the value and compare to 0 using a `when` with no parameter But are these really the only ways Can t I do something similar to the code below And to check 0 with ranges I would have to write ` in in 1 Int MAX VALUE amp amp in 1 downTo Int MIN VALUE` But this doesn t look right there must be another way right

Andreas Sinz · Answer

Only `in` `is` or a comparison `==` with an expression is supported by `when` right now

Daniele Segato · Answer

disappointed so what I wrote is actually the only way except ` 1 downTo Int MIN VALUE` is converted into 2 comparison while `x lt 0` would be only 1

Shawn · Answer

why not just

Shawn · Answer

have an if else here

Andreas Sinz · Answer

or use `when` differently ``` val x = functionReturningInteger when x lt 0 gt x gt 0 gt ```

Daniele Segato · Answer

yes I did that too slightly differently ``` functionReturningInteger let when ```

Daniele Segato · Answer

i almost never use `val = ` in my code I usually prefer using let apply with and so on not sure if that s a good idea

Shawn · Answer

if you do so at the expense of your code s readability then it s a terrible idea

Shawn · Answer

there s nothing wrong with assigning some variables here and there if it makes the relevant block easier to comprehend

Shawn · Answer

the problem is unnecessary noise not assignments at large

Daniele Segato · Answer

I don t know i like this more ``` return day compareTo other day let if it = 0 it else time compareTo time ``` then this ``` val comparison = day compareTo other day return if comparison = 0 comparison else time compareTo time ``` is it just me

Shawn · Answer

in that case I d say that repeating `comparison` over and over isn t making it easier to read

Shawn · Answer

it s not an indictment of `val x = ` as a whole

Shawn · Answer

just an example of where it doesn t make things clearer

Shawn · Answer

maybe something like this would read a bit more naturally

Shawn · Answer

``` return day compareTo other day takeIf it = 0 time compareTo other time ```

Alowaniak · Answer

Well in that particular case you should be able to do something like `compareBy it day it time compare this other ` afaict Or compareValuesBy or w e

Daniele Segato · Answer

Ah `takeIf` i didn t know about Is there a list of all of this Thanks by the way Also didn t know about compareBy

Daniele Segato · Answer

I knew let use apply also and with but couldn t find a list with all