6 Easy Ways to Trim a String in Golang

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Here are the 6 ways to trim a string in Golang.

  1. Using the “TrimSpace()” Function
  2. Using the “Trim()” Function
  3. Using the “TrimLeft()” Function
  4. Using the “TrimRight()” Function
  5.  Using the “TrimSuffix()” Function
  6. Using the “TrimPrefix()” Function

Method 1: Using the strings.TrimSpace() Function

The easiest way to trim a string in Go is to use the “strings.TrimSpace()” function. The TrimSpace() function takes one argument, which is a string, and removes leading and trailing white spaces from it.

Example

package main

import (
  "fmt"
  "strings"
)

func main() {
  str := " Bella Ramsey is Ellie! "
  fmt.Println("Before:", str)
  fmt.Println("After:", strings.TrimSpace(str))
}

Output

Before:  Bella Ramsay is Ellie!
After: Bella Ramsay is Ellie!

You can see that the TrimSpace() function removes the whitespace from the beginning and end of the string.

Method 2: Using the strings.Trim() Function

The strings.Trim() function takes two arguments: a string and a set of characters to trim all the leading and trailing Unicode code points specified in the function.

Example

package main

import (
  "fmt"
  "strings"
)

func main() {
  str := "***Bella Ramsey**"
  fmt.Println("Before:", str)
  fmt.Println("After:", strings.Trim(str, "*"))
}

Output

Before: ***Bella Ramsey**
After: Bella Ramsey

Method 3: Using the strings.TrimLeft() Function

The strings.TrimLeft() function takes two arguments: a string and a set of characters to trim from the left end of the string.

Example

package main

import (
  "fmt"
  "strings"
)

func main() {
  str := "***Bella Ramsey**"
  fmt.Println("Before:", str)
  fmt.Println("After:", strings.TrimLeft(str, "*"))
}

Output

Before: ***Bella Ramsey**
After: Bella Ramsey**

Method 4: Using the strings.TrimRight() Function

The strings.TrimRight() function takes two arguments: a string and a set of characters to trim from the right end of the string.

Example

package main

import (
  "fmt"
  "strings"
)

func main() {
  str := "***Bella Ramsey**"
  fmt.Println("Before:", str)
  fmt.Println("After:", strings.TrimRight(str, "*"))
}

Output

Before: ***Bella Ramsey**
After: ***Bella Ramsey

Method 5: Using the TrimSuffix() Function

The strings.TrimSuffix() function takes two arguments: a string and a suffix string to trim from the end of the string. 

Example

package main

import (
  "fmt"
  "strings"
)

func main() {
  str := "app.go"
  fmt.Println("Before:", str)
  fmt.Println("After:", strings.TrimSuffix(str, ".go"))
}

Output

Before: app.go
After: app

Method 6: Using the TrimPrefix() Function

The strings.TrimPrefix() function takes two arguments: a string and a prefix string to trim from the start of the string.

Example

package main

import (
  "fmt"
  "strings"
)

func main() {
  str := "app.go"
  fmt.Println("Before:", str)
  fmt.Println("After:", strings.TrimPrefix(str, "app"))
}

Output

Before: app.go
After: .go

That’s it.

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