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kotlinlang

Is there a way to make Kotlin raise an error if the amount of components in `val (a, b) = list` is too few? Python does it, and it's weird that Kotlin is the more unsafe one.

<https://play.kotlinlang.org/#eyJ2ZXJzaW9uIjoiMS45LjI1IiwicGxhdGZvcm0iOiJqYXZhIiwiYXJncyI6IiIsIm5vbmVNYXJrZXJzIjp0cnVlLCJ0aGVtZSI6ImlkZWEiLCJjb2RlIjoiZnVuIG1haW4oKSB7XG5cdHZhbCBpbnB1dCA9IGxpc3RPZigxKVxuICAgIFxuICAgIHZhbCAoYSwgYikgPSBpbnB1dFxufSJ9|https://play.kotlinlang.org/#eyJ2ZXJzaW9uIjoiMS45LjI1IiwicGxhdGZvcm0iOiJqYXZhIiwiYXJncy[…]xpc3RPZigxKVxuICAgIFxuICAgIHZhbCAoYSwgYikgPSBpbnB1dFxufSJ9>

I get a ListOutOfBounds error, which makes sense.

Or do you mean the other way around? If so, what is 'unsafe' about it?

I mean the other way around yeah. You don't get an error if your data isn't the shape the way you wanted. Which usually means your code is wrong

This just isn't how destructing works in Kotlin, it does not imply unsafety.
But you can add a `require { list.length == 2}` in front.

Kotlin just builds a destructured list based on the componentN() functions. Funnily enough, I'd rather have them be even more lenient by making them lazy.

e.g. if I have a list of arguments: `[false, 1, 3]` or `[true]` then I want to able to do `(arg1, arg2, arg3) -&gt; if(arg1){ null } else { arg2..arg3 }`

perhaps a compiler plugin can make the destructuring based on  your requirements?