String Functions #

// The standard library's `strings` package provides many
// useful string-related functions. Here are some examples
// to give you a sense of the package.

package main

import (
	"fmt"
	s "strings"
)

// We alias `fmt.Println` to a shorter name as we'll use
// it a lot below.
var p = fmt.Println

func main() {

	// Here's a sample of the functions available in
	// `strings`. Since these are functions from the
	// package, not methods on the string object itself,
	// we need pass the string in question as the first
	// argument to the function. You can find more
	// functions in the [`strings`](https://pkg.go.dev/strings)
	// package docs.
	p("Contains:  ", s.Contains("test", "es"))
	p("Count:     ", s.Count("test", "t"))
	p("HasPrefix: ", s.HasPrefix("test", "te"))
	p("HasSuffix: ", s.HasSuffix("test", "st"))
	p("Index:     ", s.Index("test", "e"))
	p("Join:      ", s.Join([]string{"a", "b"}, "-"))
	p("Repeat:    ", s.Repeat("a", 5))
	p("Replace:   ", s.Replace("foo", "o", "0", -1))
	p("Replace:   ", s.Replace("foo", "o", "0", 1))
	p("Split:     ", s.Split("a-b-c-d-e", "-"))
	p("ToLower:   ", s.ToLower("TEST"))
	p("ToUpper:   ", s.ToUpper("test"))
}

$ go run string-functions.go
Contains:   true
Count:      2
HasPrefix:  true
HasSuffix:  true
Index:      1
Join:       a-b
Repeat:     aaaaa
Replace:    f00
Replace:    f0o
Split:      [a b c d e]
ToLower:    test
ToUpper:    TEST