Go Strings Methods

Go support a wide methods and operations for Strings below is a list of the most commonly used methods:

Method	Parameters	Returns
Compare	(a string, bstring)	int
Contains	(str string, substr string)	bool
Count	(str string, substr string)	int
Index	(str string, substr string)	int
Split	(s string, sep string)	[]string
SplitAfterN	(s string, sep string, n int)	[]string
ToLower	(s string)	string
ToUpper	(s string)	string
Trim	(s string, cutset string)	string

Go String `Compare()` function

Go String Compare() function returns an integer comparing two strings lexicographically, and returns an Integer:

0 if strings are equal
-1 if First String < Second String
+1 if First String > Second String

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Println(strings.Compare("a", "b"))
	fmt.Println(strings.Compare("a", "a"))
	fmt.Println(strings.Compare("b", "a"))
}

Output

-1
0
1

Go String `Contains()` function

Go String Contains() function check whether substring is within a string and return a boolean.

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Println(strings.Contains("seafood", "foo"))
	fmt.Println(strings.Contains("seafood", "bar"))
	fmt.Println(strings.Contains("seafood", ""))
	fmt.Println(strings.Contains("", ""))
}

Output

true
false
true
true

Go String `Count()` function

Go String Count() function counts the number of non-overlapping instances of substring in a string

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Println(strings.Count("cheese", "e"))
	fmt.Println(strings.Count("five", "")) 
}

Output

3
5

Go String `Index()` function

Go String Index() function returns the index of the first instance of substring in a string

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Println(strings.Index("chicken", "ken"))
	fmt.Println(strings.Index("chicken", "dmr"))
}

Output

4
-1

Go String `Split()` function

Go String Split() function split a string into an array based on a delimiter

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Printf("%q\n", strings.Split("a,b,c", ","))
	fmt.Printf("%q\n", strings.Split(" xyz ", ""))
}

Output

["a" "b" "c"]
[" " "x" "y" "z" " "]

Go String `SplitAfterN()` function

Go String SplitAfterN() function slices s into substrings after each instance of separator and returns a slice of those substrings.

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Printf("%q\n", strings.SplitAfterN("a,b,c", ",", 2))
}

Output

["a," "b,c"]

Go String `ToLower()` function

Go String ToLower() function return a lower case string of original string

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Println(strings.ToLower("FunNy"))
}

Output

funny

Go String `ToUpper()` function

Go String ToUpper() function return an uppper case string of original string

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Println(strings.ToLower("FunNy"))
}

Output

FUNNY

Go String `Trim()` function

Go String Trim() function returns a slice of the string s with all leading and trailing Unicode code points contained in cutset removed.

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Print(strings.Trim("<<<Hello, World>>>", "<>"))
}

Output

Hello, World

Conclusion

In this page (written and validated by A. Gawali) you learned about Go Strings Methods . What's Next? If you are interested in completing Go tutorial, your next topic will be learning about: Go Array.

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