How to Check if String is Empty in Go: Simple Guide

In Go, you check if a string is empty by comparing it to an empty string literal using == "". For example, if myString == "" {} checks if myString has no characters.

Syntax

To check if a string is empty in Go, use the equality operator == to compare the string variable with an empty string literal "".

• myString: your string variable
• ==: checks if two values are equal
• "": empty string literal (no characters)

go

if myString == "" {
    // string is empty
}

Example

This example shows how to check if a string is empty and print a message accordingly.

go

package main

import "fmt"

func main() {
    var s string

    if s == "" {
        fmt.Println("The string is empty.")
    } else {
        fmt.Println("The string is not empty.")
    }

    s = "hello"

    if s == "" {
        fmt.Println("The string is empty.")
    } else {
        fmt.Println("The string is not empty.")
    }
}

Output

The string is empty.
The string is not empty.

Common Pitfalls

Some common mistakes when checking if a string is empty in Go include:

• Using len(myString) == 0 is correct but less direct than myString == "".
• Comparing to nil does not work because strings are not pointers.
• Using functions like strings.TrimSpace without understanding it removes spaces but does not check emptiness directly.

go

package main

import "fmt"

func main() {
    var s string

    // Wrong: comparing string to nil (won't compile)
    // if s == nil {
    //     fmt.Println("Empty string")
    // }

    // Correct: compare to empty string
    if s == "" {
        fmt.Println("String is empty")
    }
}

Output

String is empty

Quick Reference

Here is a quick summary of ways to check if a string is empty in Go:

Method	Description	Example
Equality check	Compare string to empty string literal	if s == "" {}
Length check	Check if string length is zero	if len(s) == 0 {}

Key Takeaways

Use myString == "" to check if a string is empty in Go.

Avoid comparing strings to nil because strings are not pointers.

You can also use len(myString) == 0 but == "" is clearer.

Remember that empty string means zero characters, not spaces or other whitespace.

Always test your string checks with both empty and non-empty values.