1 files changed, 13 insertions, 0 deletions
diff --git a/challenge-261/barroff/julia/ch-2.jl b/challenge-261/barroff/julia/ch-2.jl
new file mode 100644
index 0000000000..15caccf46d
--- /dev/null
+++ b/challenge-261/barroff/julia/ch-2.jl
@@ -0,0 +1,13 @@
+#!/usr/bin/env julia
+
+using Test: @test, @testset
+
+function multiply_by_two(start::T, ints::Vector{T})::Int where {T<:Integer}
+    start in ints ? multiply_by_two(2 * start, ints) : start
+end
+
+@testset "count even digits number" begin
+    @test multiply_by_two(3, [5, 3, 6, 1, 12]) == 24
+    @test multiply_by_two(1, [1, 2, 4, 3]) == 8
+    @test multiply_by_two(2, [5, 6, 7]) == 2
+end