Groovy map method of collections
Multi tool use
Groovy map method of collections
Is there a map method in Groovy? I want to do something like I do with the following Scala snippet:
map
scala> val l = List(1, 2, 3)
l: List[Int] = List(1, 2, 3)
scala> l.map(_ + 1)
res0: List[Int] = List(2, 3, 4)
1 Answer
1
There is such a method in groovy, it is called collect, for example:
collect
assert [1, 2, 3].collect { it * 2 } == [2, 4, 6]
http://docs.groovy-lang.org/next/html/documentation/working-with-collections.html#_iterating_on_a_list
Quite strange function name for very popular idiom
– ruX
May 31 '14 at 9:04
If you think collect is strange, wait until you come across 'inject' for reduce/fold operation!
– Καrτhικ
Dec 16 '14 at 11:39
I suspect
collect and inject are borrowed from methods by those names in Ruby's Enumerable mixin.– Roy Tinker
Apr 28 '16 at 21:20
collect
inject
@RoyTinker, is probably correct. Groovy takes some inspiration from Ruby's function names (collect, inject), and its syntax (def, optional parens, braces for closures).
– Paul Draper
Nov 7 '16 at 19:48
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assert [1,2,3].collect {it+1} == [2,3,4]
– sbglasius
Jan 19 '11 at 11:38