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#stdlib
- v
voddan
05/05/2016, 7:02 PMoperator, i didn't know how to google it
exactly! - k
kevinmost
05/05/2016, 7:15 PMto play devil's advocate, in Kotlin, those overloads aren't just magic. They're tied to a specific function. So you could even Google "operator fun string get Kotlin" and probably get something like what you wanted. And you can [Ctrl/Cmd]+B in IntelliJ on the bracket and get taken right to the method body, too - l
loganj
05/05/2016, 7:17 PMassuming you know to do so - l
loganj
05/05/2016, 7:17 PMie, that you recognize the operator is sugar for a method name - l
loganj
05/05/2016, 7:18 PMyou wouldn’t think to cmd-B on a bracket in Java. simple smile - k
kevinmost
05/05/2016, 7:18 PMthat's a good point. An IDE hint might be nice in that case. The IDE currently gives you a nice, unobtrusive little hint when you get a smart-cast in Kotlin - k
kevinmost
05/05/2016, 7:18 PMmaybe something like that for a somewhat ambiguous operator overload would be helpful too - l
loganj
05/05/2016, 7:19 PM+1 to that - l
loganj
05/05/2016, 7:21 PMor just highlighting all overloaded operators. that’d be great regardless of the string slice discussion.👍 1 - d
dean
05/05/2016, 7:21 PMAlso, knowing a string is an array of characters, passing a range of numbers into an array accessor should make sense. And it isn't like the
operator isn't common, so it should be recognized as to what it means.. - d
dean
05/05/2016, 7:23 PMA slice operator isn't really needed, we can just use ranges and progressions on the get operator, which are easily recognizable - k
kevinmost
05/05/2016, 7:24 PMif you know for-loop syntax in Kotlin, you likely know the
operator. Most people want to know how to use an indexed for loop at some point.. - k
kevinmost
05/05/2016, 7:24 PMoops, misread that as "it isn't like the
operator is common". My bad simple smile.. - d
dean
05/05/2016, 7:27 PM
should be easily recognized as"abcdef"[3]
and'd'
as"abcdef"[2..4]"cde" - m
marcinmoskala
05/05/2016, 7:45 PM - i
ilya.gorbunov
05/05/2016, 7:45 PMWe have postponed adding
with a range argument (and dropped those existed before 1.0) until we sort out with slices feature https://youtrack.jetbrains.com/issue/KT-10876operator get - s
sreich
05/05/2016, 8:31 PMi wish mutableListOf had a hint i could pass, like arraylist, which is the intial capacity it could expect - s
sreich
05/05/2016, 8:31 PMespecially if you know something will have 5000 elements at some point, those reallocs are not going to be too cheap - m
michaelrocks
05/05/2016, 8:43 PMDon’t use
then.mutableListOf - s
sreich
05/05/2016, 8:45 PMwhat can i use instead? - s
sreich
05/05/2016, 8:45 PMand i thought i was supposed to use mutableListOf for mutable lists - c
cbruegg
05/05/2016, 8:46 PMJust use a plain old ArrayList constructor - k
kevinmost
05/05/2016, 8:52 PMI could see myself wanting to pass some elements by default, though, and also provide a capacity hint. It wouldn't break any existing code if the capacity could be taken as a default parameter - k
kevinmost
05/05/2016, 8:52 PMOtherwise, the only way to do this is something likeCopy code
, not nearly as nice. We could roll our own function but it seems like a standard thing to wantArrayList(5000).apply { /* add initial elements */ } - o
orangy
05/05/2016, 10:25 PM@kevinmost: can you show the prototype function as you want it to see in stdlib? I’m not quite sure how it is supposed to work, e.g. for list of integers. - k
kevinmost
05/05/2016, 11:50 PM@orangy: You're right actually. Forgot about that situation... I suppose it isn't possible, given that fact! - o
orangy
05/05/2016, 11:51 PMWell, you can have it like thisfun <T> arrayListOf(vararg elements: T, size: Int = -1): MutableList<T> { .. } - k
kevinmost
05/05/2016, 11:51 PMahh, and then
can only be given as a named param, right?size - o
orangy
05/05/2016, 11:51 PMCopy codearrayListOf("3", "2", "1", 4) // MutableList of Any arrayListOf("3", "2", "1", size = 4) // MutableList of String of size 4 - o
orangy
05/05/2016, 11:51 PMBut that’s a lot of confusion