How to Filter Elements of an Array based on a Condition in Go - Step by Step Examples

How to Filter Elements of an Array based on a Condition in Go ?

Answer

To filter elements of an array based on a condition in Go, you can use a loop to iterate through the array and a conditional statement to check each element against the specified condition.

✐ Examples

1 Filter Even Numbers from an Integer Array

In this example,

We define a function named filterEvenNumbers that takes an integer slice arr as a parameter.
Inside the function, we create a new slice result to store the filtered elements.
We use a loop to iterate through each element in the array arr.
Within the loop, we use an if statement to check if the current element is even (i.e., num % 2 == 0).
If the condition is met, we append the element to the result slice.
After the loop completes, we return the result slice containing only the even numbers.
In the main function, we call the filterEvenNumbers function with a sample array and print the filtered result.

Go Program

package main

import "fmt"

func filterEvenNumbers(arr []int) []int {
    result := []int{}
    for _, num := range arr {
        if num % 2 == 0 {
            result = append(result, num)
        }
    }
    return result
}

func main() {
    arr := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
    evenNumbers := filterEvenNumbers(arr)
    fmt.Println("Filtered even numbers:", evenNumbers)
}

Output

Filtered even numbers: [2 4 6 8 10]

2 Filter Strings Containing a Specific Substring

In this example,

We define a function named filterStringsContaining that takes a slice of strings arr and a substring substr as parameters.
Inside the function, we create a new slice result to store the filtered elements.
We use a loop to iterate through each element in the array arr.
Within the loop, we use an if statement with the strings.Contains function to check if the current element contains the specified substring.
If the condition is met, we append the element to the result slice.
After the loop completes, we return the result slice containing only the strings that include the substring.
In the main function, we call the filterStringsContaining function with a sample array and substring, then print the filtered result.

Go Program

package main

import (
    "fmt"
    "strings"
)

func filterStringsContaining(arr []string, substr string) []string {
    result := []string{}
    for _, str := range arr {
        if strings.Contains(str, substr) {
            result = append(result, str)
        }
    }
    return result
}

func main() {
    arr := []string{"apple", "banana", "cherry", "date", "fig", "grape"}
    filteredStrings := filterStringsContaining(arr, "a")
    fmt.Println("Filtered strings containing 'a':", filteredStrings)
}

Output

Filtered strings containing 'a': [apple banana date grape]

Summary

In this tutorial, we learned How to Filter Elements of an Array based on a Condition in Go language with well detailed examples.

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How to Filter Elements of an Array based on a Condition in Go - Step by Step Examples

How to Filter Elements of an Array based on a Condition in Go ?

Answer

✐ Examples

1 Filter Even Numbers from an Integer Array

Go Program

Output

2 Filter Strings Containing a Specific Substring

Go Program

Output

Summary

More Go Arrays Tutorials