How to create unfixed length slice in Go

Question

I'm new in Go and I have 2 questions:

1 Let's say we have simple for loop written in C#:

static void Main(string[] args)
    {
        List<int> list = new List<int>();
        for (int i = 1; i < 10000; i++)
        {
            if (i % 5 == 0 && i % 3 == 0)
            {
                list.Add(i);
            }
        }
        foreach (int prime in list)
        {
            System.Console.WriteLine(prime);
        }
        Console.ReadKey();
    }

If I wanted to do the same in Go I'll have to use slices. But how to do that?

Which of variable declaration form is more often used: short form (s:= 3) or long (var s int = 3)?

Slices are not fixed length in Go. This is the best article I have ever seen on slices: blog.golang.org/go-slices-usage-and-internals — miltonb
On variable declaration style, I use the short form when initializing a variable to a certain value, but the long form when just declaring a variable which will be set later (or when declaring a package variable (i.e., outside of any block), which can only be done with var). — Andy Schweig
@seeker there are three answers already check and if any of them help accept the answer other wise comment here as to what is missing — Sarath Sadasivan Pillai

Sarath Sadasivan Pillai Sarath Sadasivan Pillai · Accepted Answer · 2016-12-29T00:58:51

In Go arrays have their place, but they're a bit inflexible, so you don't see them too often in Go code. Slices, though, are everywhere . They build on arrays to provide great power and convenience.

Slice is not of fixed length. It is flexible .

You may declare an empty slice as following

list := make([]int, 0)
list := []int{}
var list []int

Here is how you may right the above function in go

package main

import (
    "fmt"
)


func main() {
        var list []int
        for i:=0;i<10000;i++ {
            if i %5 == 0 && i % 3 == 0 {
                list = append(list, i)
            }
        } 
        for _, val := range list {
            fmt.Println(val)
        }
}

Here is the play link play

How to create unfixed length slice in Go

3 Answers