How to fill a slice with values in Go

Filling a slice with a repeated pattern
Created
Modified

Using for Loop

Using a for loop is the simplest solution. Fill the slice with the value 8 by looping through each element and setting the value.

package main

import "fmt"

func main() {

  slice := make([]int64, 10, 10)

  for i := 0; i < len(slice); i++ {
    slice[i] = 8
  }
  fmt.Println(slice)
}
[8 8 8 8 8 8 8 8 8 8]

Using for range

For example,

package main

import "fmt"

func main() {

  slice := make([]int64, 10, 10)

  for i := range slice {
    slice[i] = 8
  }
  fmt.Println(slice)
}
[8 8 8 8 8 8 8 8 8 8]

Using the copy trick

Example of using the copy trick to fill an array/slice with a multi-element pattern.

package main

import "fmt"

func main() {

  // the pattern
  pattern := []int64{8, 9, 10}

  slice := make([]int64, 10, 10)

  copy(slice, pattern)

  for i := len(pattern); i < len(slice); i *= 2 {
    copy(slice[i:], slice[:i])
  }
  fmt.Println(slice)
}
[8 9 10 8 9 10 8 9 10 8]

Using append Function

The resulting value of append is a slice containing all the elements of the original slice plus the provided values.

package main

import "fmt"

func main() {

  slice := []int64{}

  for i := 0; i < 10; i++ {
    slice = append(slice, 8)
  }
  fmt.Println(slice)
}
[8 8 8 8 8 8 8 8 8 8]

Related Tags

#fill# #slice#

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