Implement halve(Iterators.reverse(...)) (#60)

Author: tkf

README.md

@@ -42,6 +42,7 @@ SplittablesBase.jl:
 * `Iterators.partition`
 * `Iterators.product`
 * `Iterators.enumerate`
+* `Iterators.reverse`
 * `skipmissing`
 
 ## Packages using SplittablesBase.jl

src/implementations.jl

@@ -270,6 +270,11 @@ function halve(xs::Iterators.Enumerate)
     return enumerate(left), zip(length(left)+1:length(xs), right)
 end
 
+function halve(xs::Iterators.Reverse)
+    left, right = halve(xs.itr)
+    return Iterators.reverse(right), Iterators.reverse(left)
+end
+
 amount(xs::Base.SkipMissing) = amount(arguments(xs)[1])
 
 function halve(xs::Base.SkipMissing)

test/test_halve.jl

@@ -60,6 +60,8 @@ zip("αβγ")
 zip(enumerate([11, 22, 33, 44]), 'a':'d')
 zip(enumerate([11, 22, 33, 44, 55]), 'a':'e')
 zip(Iterators.product(1:3, 'a':'b'), ones(3, 2))
+Iterators.reverse(1:10)
+Iterators.reverse(zip(1:3, 'a':'c'))
 skipmissing([1, 2, missing, 4])
 skipmissing([1, 2, missing, 4, 5])
 """