Golang : How to get capacity of a slice or array?

Problem :

You have a slice and you need to find out the capacity of the slice.

Solution :

Use the builtin function cap() to determine the slice's maximum length or the number of elements inside the array.

For example :

 package main

 import (

 var a = make([]int, 7, 8)

 func main() {

  for i := 0; i < 7; i++ {
 a[i] = i

  fmt.Printf("Size of slice a is : %d", cap(a))


References :



  See also : Golang : Delete duplicate items from a slice/array

By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.