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[Author: @mdimamhosen Date: 2025-04-19 Category: interview-qa/strings Tags: [go, strings, operations]]

GoLang Strings

This document provides an overview of string operations in GoLang with examples.

Frequently Asked Questions

1. How do you concatenate strings in Go?

You can concatenate strings using the + operator.

fmt.Println("Hello, " + "World!")

2. How do you find the length of a string in Go?

Use the len function to get the length of a string.

message := "Hello World!"
fmt.Println("Length:", len(message))

3. How do you extract a substring in Go?

Use slice notation to extract substrings.

message := "Hello World!"
fmt.Println("Substring:", message[0:5]) // "Hello"

4. How do you compare two strings in Go?

You can use == and != operators or the strings.Compare function.

msg1 := "one"
msg2 := "two"
fmt.Println("Equal?", msg1 == msg2)
fmt.Println("Not Equal?", msg1 != msg2)
fmt.Println(strings.Compare(msg1, msg2))

5. How do you check if a string contains a substring?

Use the strings.Contains function.

message := "Hello World!"
fmt.Println(strings.Contains(message, "World")) // true

6. How do you convert a string to uppercase or lowercase?

Use strings.ToUpper and strings.ToLower functions.

message := "Hello World!"
fmt.Println(strings.ToUpper(message)) // "HELLO WORLD!"
fmt.Println(strings.ToLower(message)) // "hello world!"

7. How do you split a string into substrings?

Use the strings.Split function.

message := "Hello World!"
fmt.Println(strings.Split(message, " ")) // ["Hello", "World!"]

8. How do you replace a substring in a string?

Use the strings.Replace function.

message := "Hello World!"
fmt.Println(strings.Replace(message, "World", "Go", 1)) // "Hello Go!"

9. How do you trim spaces from a string?

Use the strings.TrimSpace function.

message := "  Hello World!  "
fmt.Println(strings.TrimSpace(message)) // "Hello World!"

10. How do you get the first character of a string?

Use indexing to access the first character.

message := "Hello World!"
fmt.Printf("First character: %c\n", message[0])

Basic String Operations

Concatenation

You can concatenate strings using the + operator.

fmt.Println("Hello, " + "World!")

Formatting Strings

Go provides several ways to format strings using fmt.Printf.

message := "Hello World!"
fmt.Printf("Data: %v\n", message)
fmt.Printf("Data: %+v\n", message)
fmt.Printf("Data: %#v\n", message)
fmt.Printf("Data: %T\n", message)
fmt.Printf("Data: %q\n", message)
fmt.Printf("First character: %c\n", message[0])

String Length

You can get the length of a string using the len function.

fmt.Println("Length:", len(message))

Substrings

You can extract substrings using slice notation.

fmt.Println("Substring:", message[0:5]) // this will print "Hello"

String Comparison

You can compare strings using == and != operators or the strings.Compare function.

msg1 := "one"
msg2 := "two"

fmt.Println("Equal?", msg1 == msg2)
fmt.Println("Not Equal?", msg1 != msg2)
fmt.Println(strings.Compare(msg1, msg2))

Additional String Functions

Contains

Check if a string contains a substring.

fmt.Println(strings.Contains(message, "World")) // true

ToUpper and ToLower

Convert strings to upper or lower case.

fmt.Println(strings.ToUpper(message)) // "HELLO WORLD!"
fmt.Println(strings.ToLower(message)) // "hello world!"

Split

Split a string into a slice of substrings.

fmt.Println(strings.Split(message, " ")) // ["Hello", "World!"]

Replace

Replace occurrences of a substring.

fmt.Println(strings.Replace(message, "World", "Go", 1)) // "Hello Go!"

Trim

Trim leading and trailing spaces.

fmt.Println(strings.TrimSpace("  Hello World!  ")) // "Hello World!"

Refer to the Go documentation for more string functions and detailed usage.