Skip to content

Latest commit

 

History

History
30 lines (20 loc) · 915 Bytes

README.md

File metadata and controls

30 lines (20 loc) · 915 Bytes
Raw

Local boolean

Checking a sequence of boolean conditions:

  • individually with a boolean in func scope
  • individually with a boolean in if scope
  • inside a for loop using a bool in func scope
  • inside a for loop shadowing a bool in if scope

The example is theoretical and should prevent compiler optimization of the tests applied to each value.

If the if instructions are in sequence, var creation inside the if is expensive. Inside a for loop for a sequence of tests of the same size, shadowing is so optimized that you don't need to bother.

src>go test -bench=. ./isvalid

Results

go version go1.12 windows/amd64

BenchmarkCheckValueFuncVar-4    20000000                80.3 ns/op
BenchmarkCheckValueIfVar-4      20000000                82.2 ns/op
BenchmarkCheckValueForFunc-4    20000000                88.9 ns/op
BenchmarkCheckValueForIf-4      20000000                85.3 ns/op
PASS