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reflect: MapKeys on map returns the slice of all values from map, not keys #31617

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workanator opened this issue Apr 22, 2019 · 3 comments
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reflect: MapKeys on map returns the slice of all values from map, not keys #31617

workanator opened this issue Apr 22, 2019 · 3 comments
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@workanator
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Hello, when I do reflect.ValueOf(m).MapKeys() where m is a map I get the slice of values from the map, not keys. The same issue with MapRange(), returned iterator returns values disregarding what do you call, Key() or Value(). Is that the correct behaviour or is that a bug?

You can try that behaviour here. I suppose the output should contain key1, two, sdkjf.

I'm using the latest version of Go 1.12.3, linux/amd64

My ENV is

GOARCH="amd64"
GOBIN=""
GOCACHE="/home/ME/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/devel/projects/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build558732631=/tmp/go-build -gno-record-gcc-switches"
@julieqiu julieqiu changed the title MapKeys on map returns the slice of all values from map, not keys reflect: MapKeys on map returns the slice of all values from map, not keys Apr 22, 2019
@seebs
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seebs commented Apr 22, 2019

try for idx, value := range slice instead of for value := range slice.

@dominikh
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Closing, not a bug, just iterating over the slice incorrectly.

@workanator
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Oh! So stupid mistake. They say do not work late at night. I do not listen...
Thank you guys for the help. And sorry for wasting your time.

@golang golang locked and limited conversation to collaborators Apr 22, 2020
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@dominikh @seebs @gopherbot @workanator