Apply mapping functions when indexing mapped iterators

.github/workflows/ci.yml

@@ -11,6 +11,9 @@ jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
+    permissions:
+      contents: read
+      id-token: write
     strategy:
       fail-fast: false
       matrix:
@@ -48,6 +51,8 @@ jobs:
       - uses: codecov/codecov-action@v5
         with:
           files: lcov.info
+          use_oidc: ${{ github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository }}
+          fail_ci_if_error: true
   # docs:
   #   name: Documentation
   #   runs-on: ubuntu-latest

src/map.jl

@@ -68,7 +68,7 @@ Base.length(it::MappedIterator) = length(it.parent)
 Base.size(it::MappedIterator) = size(it.parent)
 Base.axes(it::MappedIterator) = axes(it.parent)
 Base.keys(it::MappedIterator) = keys(it.parent)
-@propagate_inbounds Base.getindex(it::MappedIterator, i) = it.parent[i]
+@propagate_inbounds Base.getindex(it::MappedIterator, i) = it.f(it.parent[i])
 
 struct MappedArray{T, N, F, A <: AbstractArray{<:Any, N}} <: AbstractArray{T, N}
 	f::F

test/map.jl

@@ -21,6 +21,26 @@ end
     iter2 = mapview(x -> x[1] + x[2], iter)
     @test @inferred(first(iter2)) === 2
     @test collect(iter2) == [2, 4, 6]
+
+    @testset "Indexed iterables" begin
+        parent = (1, 2, 3)
+        mapped = mapview(x -> 10x, parent)
+        @test collect(mapped) == [10, 20, 30]
+        @test @inferred(mapped[2]) == 20
+        @test [mapped[i] for i in keys(mapped)] == collect(mapped)
+        @test @inferred(mapview(string, parent)[3]) == "3"
+        @test @inferred(mapview(abs, (a=-1, b=-2))[:b]) == 2
+        @test_throws BoundsError mapped[4]
+        @test_throws DomainError mapview(x -> throw(DomainError(x)), parent)[1]
+        calls = Ref(0)
+        lazy = mapview(parent) do x
+            calls[] += 1
+            x + 1
+        end
+        @test calls[] == 0
+        @test lazy[2] == 3
+        @test calls[] == 1
+    end
 end
 
 @testset "filterview" begin