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Go – bytes.Contains() function in go

bytes.Contains() function is used to check whether subslice is present within another slice in go. It returns true If present else false.

bytes.Contains() function prototype:

func Contains(b, subslice []byte) bool

or

func Contains(b []byte, subslice []byte) bool

Input parameters:
b: byte slice
subslice: byte subslice

subslice will be checked within byte slice b.

bytes.Contains() function return value:

bytes.Contains() function returns true If subslice is present within another slice else false.

Explanation:

1)
b := []byte("Jhon is attending coding contest")
subslice := []byte("Jhon is attending")

Here, subslice is present within b. So It will return true.

2)
b := []byte("Jhon is attending coding contest")
subslice := []byte("where is he")

Here, subslice is not present within b. So It will return false.

Example:

Code 1:

package main

import (
    "fmt"
    "bytes"
)

func main() {
    
    // Subslice is present within another slice
    b := []byte("Jhon is attending coding contest")
    subslice := []byte("Jhon is attending")
    
    is_subslice_pre := bytes.Contains(b, subslice)
    
    fmt.Println("Is subslice present: ", is_subslice_pre)
    
    // Subslice is not present within another slice
    b = []byte("Jhon is attending coding contest")
    subslice = []byte("where is he")
    
    is_subslice_pre = bytes.Contains(b, subslice)
    
    fmt.Println("Is subslice present: ", is_subslice_pre)
}

Output:

Is subslice present:  true
Is subslice present:  false

Code 2:

package main

import (
    "fmt"
    "bytes"
)

func main() {
    
    // Subslice is present within another slice
    b := []byte{10, 20, 30, 40}
    subslice := []byte{20, 30}
    
    is_subslice_pre := bytes.Contains(b, subslice)
    
    fmt.Println("Is subslice present: ", is_subslice_pre)
    
    // Subslice is not present within another slice
    b = []byte{10, 20, 30, 40}
    subslice = []byte{50, 60}
    
    is_subslice_pre = bytes.Contains(b, subslice)
    
    fmt.Println("Is subslice present: ", is_subslice_pre)
}

Output:

Is subslice present:  true
Is subslice present:  false

To learn more about golang, Please refer given below link:

References:

https://golang.org/doc/

Posted in bytes, golang, packages

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