go/test/typeparam/smallest.go

// run -gcflags=-G=3

// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import (
	"fmt"
)

type Ordered interface {
	type int, int8, int16, int32, int64,
		uint, uint8, uint16, uint32, uint64, uintptr,
		float32, float64,
		string
}

func Smallest[T Ordered](s []T) T {
	r := s[0] // panics if slice is empty
	for _, v := range s[1:] {
		if v < r {
			r = v
		}
	}
	return r
}

func main() {
	vec1 := []float64{5.3, 1.2, 32.8}
	vec2 := []string{"abc", "def", "aaa"}

	want1 := 1.2
	if got := Smallest(vec1); got != want1 {
		panic(fmt.Sprintf("got %d, want %d", got, want1))
	}
	want2 := "aaa"
	if got := Smallest(vec2); got != want2 {
		panic(fmt.Sprintf("got %d, want %d", got, want2))
	}
}