add geomean(inteval)

Project.toml

@@ -9,10 +9,12 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 [weakdeps]
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
+StatsBase = "2913bbd2-ae8a-5f71-8c99-4fb6c76f3a91"
 
 [extensions]
 IntervalSetRandomExt = "Random"
 IntervalSetsStatisticsExt = "Statistics"
+IntervalSetsStatsBaseExt = "StatsBase"
 
 [compat]
 Aqua = "0.7"
@@ -25,8 +27,9 @@ Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 OffsetArrays = "6fe1bfb0-de20-5000-8ca7-80f57d26f881"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
+StatsBase = "2913bbd2-ae8a-5f71-8c99-4fb6c76f3a91"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 
 [targets]
-test = ["Aqua", "Dates", "Test", "Random", "OffsetArrays", "Statistics", "Unitful"]
+test = ["Aqua", "Dates", "Test", "Random", "OffsetArrays", "StatsBase", "Statistics", "Unitful"]

ext/IntervalSetsStatsBaseExt.jl

@@ -0,0 +1,8 @@
+module IntervalSetsStatsBaseExt
+
+using IntervalSets
+using StatsBase
+
+StatsBase.geomean(d::AbstractInterval) = sqrt(leftendpoint(d) * rightendpoint(d))
+
+end

test/runtests.jl

@@ -1,6 +1,7 @@
 using IntervalSets
 using Test
 using Dates
+using StatsBase: geomean
 using Statistics
 import Statistics: mean
 using Random
@@ -136,6 +137,7 @@ struct IncompleteInterval <: AbstractInterval{Int} end
         @test width(ClosedInterval(4.0,8.0)) ≡ 4.0
 
         @test mean(0..1) == 0.5
+        VERSION ≥ v"1.9" && @test geomean(1..100) == 10
 
         @test promote(1..2, 1.0..2.0) === (1.0..2.0, 1.0..2.0)
     end