:sos: Require knowledge from all the Kotlin Gurus. I was looking into a JavaScript code and found ...

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[Rooparsh]

🆘

Require knowledge from all the Kotlin Gurus.

I was looking into a JavaScript code and found the following syntax

const {a , …remaining} = user

… is called spread operator in JavaScript

Where

user = {a : "12", b : 2 , c: "Some random String"}

so the value of user.a was copied in variable a and all the remaining keys of user object user.b and user.c were copied in remaining variable.

This concept is called Destructuring  and in kotlin world, the nearest possible syntax that I know, is

val (a,b,c) = user

But, can we write this anyway better without declaring 3 variables ???

So, that my final code should be

val (a,remaining) = user

[Tobias Berger]

Destructuring in JS and destruction in Kotlin work very differently.
JS does this based on field names and has the possibility to put "the rest" into a separate object, which is no problem in JS because your types are dynamic and not strongly typed.
In Kotlin, destruction works by calling the componentN() operator functions of the object you want to destruct (component1() for the first value, component2() for the second and so on).
If there was a way to use something like the JS spread operator in Kotlin here, what would the type of remaining be? The only thing I could think of is a List, probably without a useful generic type.

[Rooparsh]

Makes sense. This thought didn’t cross my mind that Kotlin is statically typed language and Javascript is loosely typed language. 💡

[stephanmg]

strongly typed is not equal to statically typed

[Tobias Berger]

@stephanmg you're right, I mean statically typed of course

[stephanmg]

@Tobias Berger hey, that’s fine, I guessed you wanted to refer to static typing.