reflect.Value.Len
standard libraryThe 265th most-called standard-library method by production calls. Called 3,979 times across 465 modules; 3,703 of those run outside tests and generated code.
0% in production calls vs 2026-W39 (3,694 → 3,703)
- prod calls
- 3,703
- non-test, non-generated
- all calls
- 3,979
- total callsites
- modules
- 465
- distinct callers
- in loop
- 13%
- of prod calls
- in tests
- 6%
- 241 calls
- resolved
- 100%
- to a known target
resolution mix
How each call resolves
How each call was attributed. Only resolved kinds, where the target function is known, count toward the ranking. Interface dispatch and unresolved receivers are reported separately and never guessed. Read the taxonomy →
- Concrete method100%A method on a value whose type is known exactly.
- Embedded method<1%Reached through an embedded type.
who calls this
Notable callers
Production calls into Value.Len from notable Go projects. Open one on the map to see what else it hammers.
- Kubernetes 286 8%
- Hugo 74 2%
- Go (golang.org/x) 52 1%
- HashiCorp 50 1%
- OpenTelemetry 39 1%
where it's called
Callsites in the wild
12 representative callsites of 3,979, prioritizing in-loop and non-test usage. We link to source, never display it.
-
cdr.dev/slog @v1.6.1
map.go:63
in loop - in loop
-
cockroachdb/cockroach @v19.2.12+incompatible
in loop - in loop
-
dario.cat/mergo @v1.0.2
merge.go:161
in loop - in loop
-
gitea.dev @v1.27.3
modules/translation/i18n/format.go:30
in loop -
Azure/go-autorest/autorest @v0.11.30
utility.go:131
in loop -
GoogleCloudPlatform/terraformer @v0.0.0-20260316201050-1807affdde9e
in loop - in loop
- in loop
- in loop
top callers
The modules that reach for it
The modules that call Value.Len most in this snapshot.
- github.com/kubernetes/kubernetes962%
- github.com/DataDog/datadog-api-client-go/v2802%
- github.com/gohugoio/hugo782%
- github.com/gogo/protobuf712%
- github.com/thoas/go-funk702%
siblings
More from reflect
The other most-called members in this package. See all →