Map()

The strings.Map() method changes the characters of a provided string according to a given mapping function. It returns a modified copy of the original string.

Syntax

strings.Map(mappingFunc(r), s)

The strings.Map() function takes two parameters:

• mappingFunc(r): A function and a character (type rune) that the original character will be replaced with.
• s: The given string in which the characters will be replaced.

Note: If a negative value is returned when a character is mapped, it is dropped from the string without a replacement.

Example

The following example shows the implementation of strings.Map():

package main

import (
  "fmt"
  "strings"
)

func main() {
  mapped := func(r rune) rune {
    if r == 'e' {
      return '3'
    }
    return r
  }

  input := "Halloween"

  result := strings.Map(mapped, input)
  fmt.Println(result)
}

This example results in the following output:

Hallow33n

Codebyte Example

The following example can be run and uses the strings.Map() function to replace the character "a" with "@".

Code
Output
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Run