Go language: Check for the existence of element in array or slice

Approach 1: Iterate over array or slice and return true when the element found

func isElementExist(ele string, arr []string) bool {

    for _, data := range arr {

        if data == ele {

            return true

        }

    }

    return false

}

App.go

package main

import "fmt"

func isElementExist(ele string, arr []string) bool {
    for _, data := range arr {
        if data == ele {
            return true
        }
    }

    return false
}

func main() {
    exist := isElementExist("Krishna", []string{"Hari", "Krishna", "Ram", "Chamu"})

    fmt.Println("Is Krishna exists in array : ", exist)
}

Output

Is Krishna exists in array :  true

Approach 2: Using Map as set

If you don’t want to iterate over the array every time, then by storing all the elements as keys in map, you can check for the existence of element.

App.go

package main

import "fmt"

func main() {
    employeeNames := make(map[string]bool)

    employeeNames["Hari"] = true
    employeeNames["Krishna"] = true
    employeeNames["Ram"] = true
    employeeNames["Chamu"] = true

    fmt.Println("Is Krishna exists in array : ", employeeNames["Krishna"])
}

Output

Is Krishna exists in array :  true

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Go language: Append an element to a slice

‘append’ method is used to append an element to a slice.

Example

var vowels = []string{"a", "e", "i"}

vowels = append(vowels, "o")

App.go

package main

import "fmt"

func main() {

 var vowels = []string{"a", "e", "i"}

 vowels = append(vowels, "o")
 vowels = append(vowels, "u")

 fmt.Println(vowels)

}

Output

[a e i o u]

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