damn reflect you slow but i still <3 you

deepequal_test.go

package main

import (
    "reflect"
    "testing"
)

func BenchmarkMapsEqualsManual(b *testing.B) {
    m1 := newMap()
    m2 := newMap()

    for i := 0; i < b.N; i++ {
        manualEquals(m1, m2)
    }
}

func BenchmarkMapsEqualReflection(b *testing.B) {
    m1 := newMap()
    m2 := newMap()

    for i := 0; i < b.N; i++ {
        reflect.DeepEqual(m1, m2)
    }
}

func manualEquals(m1, m2 map[string]string) bool {
    if len(m1) != len(m2) {
        return false
    }
    for k,v := range m1 {
        if v2, ok := m2[k]; !ok || v != v2 {
            return false
        }
    }
    return true
}

func newMap() map[string]string {
    m := make(map[string]string)
    m["foo"] = "bar"
    m["bar"] = "baz"
    return m
}

results

~/Desktop % go test -bench  .
testing: warning: no tests to run
PASS
BenchmarkMapsEqualsManual       20000000                86.0 ns/op
BenchmarkMapsEqualReflection     2000000               958 ns/op
ok      _/Users/cvandyck/Desktop        4.671s