Check if the specified element is present in the slice of bytes in Golang

Last Updated : 26 Aug, 2019

In Go language slice is more powerful, flexible, convenient than an array, and is a lightweight data structure. The slice is a variable-length sequence which stores elements of a similar type, you are not allowed to store different type of elements in the same slice. In the Go slice of bytes, you can check the given slice contain the specified element or not using the following functions. These functions are defined under the bytes package so, you have to import bytes package in your program for accessing these functions.

1. Contains: This function is used to check whether the specified element is present or not in the given slice of bytes. This method returns true if the element present in the slice, or return false if the element is not present in the given slice.

Syntax:

func Contains(slice_1, sub_slice []byte) bool

Example:

// Go program to illustrate how to check the 
// slice contains the specified element in it 
package main 
  
import ( 
    "bytes"
    "fmt"
) 
  
func main() { 
  
    // Creating and initializing 
    // slice of bytes 
    // Using shorthand declaration 
    slice_1 := []byte{'A', 'N', 'M', 
                      'O', 'P', 'Q'} 
  
    // Checking the slice 
    // using Contains function 
    res1 := bytes.Contains(slice_1, []byte{'A'}) 
    res2 := bytes.Contains(slice_1, []byte{'x'}) 
    res3 := bytes.Contains([]byte("GeeksforGeeks"), []byte("ks")) 
    res4 := bytes.Contains([]byte("Geeks"), []byte("")) 
    res5 := bytes.Contains([]byte(""), []byte("")) 
  
    // Displaying results 
    fmt.Println("Result 1:", res1) 
    fmt.Println("Result 2:", res2) 
    fmt.Println("Result 3:", res3) 
    fmt.Println("Result 4:", res4) 
    fmt.Println("Result 5:", res5) 
  
} 

Output:

Result 1: true
Result 2: false
Result 3: true
Result 4: true
Result 5: true

2. ContainsAny: This function is used to check whether any of the UTF-8-encoded code points in chars is present or not in the given slice of bytes. This method returns true if any of the UTF-8-encoded code points in chars is present in the slice, or return false if any of the UTF-8-encoded code points in chars is not present in the given slice.

Syntax:

func ContainsAny(slice_1 []byte, charstr string) bool

Example:

// Go program to illustrate how to check the 
// slice contain the specified string in it 
package main 
  
import ( 
    "bytes"
    "fmt"
) 
  
func main() { 
  
    // Creating and initializing 
    // slice of bytes 
    // Using shorthand declaration 
  
    slice_1 := []byte{'A', 'N', 'M', 'O', 'P', 'Q'} 
  
    // Checking the slice 
    // Using ContainsAny function 
    res1 := bytes.ContainsAny(slice_1, "A") 
    res2 := bytes.ContainsAny(slice_1, "a") 
    res3 := bytes.ContainsAny([]byte("GeeksforGeeks"), "ksjkd") 
    res4 := bytes.ContainsAny([]byte("Geeks"), "") 
    res5 := bytes.ContainsAny([]byte(""), "") 
  
    // Displaying results 
    fmt.Println("Result 1:", res1) 
    fmt.Println("Result 2:", res2) 
    fmt.Println("Result 3:", res3) 
    fmt.Println("Result 4:", res4) 
    fmt.Println("Result 5:", res5) 
  
} 

Output:

Result 1: true
Result 2: false
Result 3: true
Result 4: false
Result 5: false

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Check if the specified element is present in the slice of bytes in Golang

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