Can i do something like this in kotlin? ```products.sort { a,b -> }```

# announcements

[Sergio Crespo Toubes]

Can i do something like this in kotlin?

products.sort {
            a,b -> }

[Andreas Sinz]

what exactly are you trying to do?

[Sergio Crespo Toubes]

i need to sort two elements by distance

[Sergio Crespo Toubes]

and i have latitude and longitude variables

[gildor]

Depends on case.
There are sortedBy, sortedWith, sortBy, sortWith. extensions

[gildor]

sorted and sort versions are different, one returns copy of collection, another sorts mutable collection

[gildor]

probably you need something like:

products.sortWith(Comparator { a, b ->  })

[Sergio Crespo Toubes]

thanks

[gildor]

But if your collection element implements Comparable, you can just do something like:

products.sortBy { it.distance }

or

products.sortBy { it.location }

[gildor]

but distance or location must be Comparable

[Sergio Crespo Toubes]

val productLocation = Location()
            productLocation.latitude = it.address!!.latitude
            productLocation.longitude = it.address!!.longitude
            mLocationManager.distanceTo(productLocation, androidLocation)

[Sergio Crespo Toubes]

this was my solution

[Sergio Crespo Toubes]

thank you

[Sergio Crespo Toubes]

but it´s nice learn how to use comparator

[gildor]

you can also convert location to distance (or some object with distance) using map and than sort just by distance.
Because calculating distnace on each comparasion doesn’t looks like an efficient way to do that (you have much more comparisons than items in your list)