package main

import (
"fmt"
"strings"
"unicode"
)

/*
1、func Trim(s string, cutset string) string
 

將字串s中首尾包含cutset中的任一字元去掉返回

2、func TrimFunc(s string, f func(rune) bool) string
將字串s首尾滿足函式f(r)==true的字元去掉返回

3、func TrimLeft(s string, cutset string) string
將字串s左邊包含cutset中的任一字元去掉返回

4、func TrimLeftFunc(s string, f func(rune) bool) string
將字串s左邊滿足函式f(r)==true的字元去掉返回

5、func TrimRight(s string, cutset string) string
 

將字串s右邊包含cutset中的任一字元去掉返回

6、func TrimRightFunc(s string, f func(rune) bool) string
將字串s右邊滿足函式f(r)==true的字元去掉返回

7、func TrimSpace(s string) string
將字串s首尾空白去掉返回

8、func TrimPrefix(s, prefix string) string
將字串s中字首字串prefix去掉返回

9、func TrimSuffix(s, suffix string) string
將字串s中字尾字串prefix去掉返回
 */

func main() {
	TestTrim()
 


	TestTrimFunc()

	TestTrimLeft()

	TestTrimLeftFunc()

	TestTrimRight()

	TestTrimRightFunc()
	TestTrimSpace()

	TestTrimPrefix()

	TestTrimSuffix()

}

func TestTrim() {
	fmt.Println(strings.Trim("  steven wang   " , " "))//steven wang
}

func TestTrimFunc() {
	f := func(c rune) bool {
return !unicode.IsLetter(c) && !unicode.IsNumber(c)
	}
	fmt.Println(strings.TrimFunc("！@#￥%steven wang%￥#@" , f))//steven wang
}

func TestTrimLeft() {
	fmt.Println(strings.TrimLeft("  steven wang   " , " "))//steven wang
}

func TestTrimLeftFunc() {
	f := func(c rune) bool {
return !unicode.IsLetter(c) && !unicode.IsNumber(c)
	}
	fmt.Println(strings.TrimLeftFunc("！@#￥%steven wang%￥#@" , f))//steven wang%￥#@
}

func TestTrimRight() {
	fmt.Println(strings.TrimRight("  steven wang   " , " "))//  steven wang
}

func TestTrimRightFunc() {
	f := func(c rune) bool {
return !unicode.IsLetter(c) && !unicode.IsNumber(c)
	}
	fmt.Println(strings.TrimRightFunc("！@#￥%steven wang%￥#@" , f))//！@#￥%steven wang
}

func TestTrimSpace() {
	fmt.Println(strings.TrimSpace(" \t\n a lone gopher \n\t\r\n"))//a lone gopher
}

func TestTrimPrefix() {
var s = "Goodbye,world!"
	s = strings.TrimPrefix(s, "Goodbye")//,world!
	fmt.Println(s)
}

func TestTrimSuffix() {
var s = "Hello, goodbye, etc!"
	s = strings.TrimSuffix(s, "goodbye, etc!")//Hello,
	fmt.Println(s)
}