How to range array in golang to not randomize predetermined key?

Question

I have a trouble with my current golang's project.

I have another package in go that result an array with pretedermined key, example :

package updaters

var CustomSql map[string]string

func InitSqlUpdater() {
    CustomSql = map[string]string{
        "ShouldBeFirst": "Text Should Be First",
        "ShouldBeSecond": "Text Should Be Second",
        "ShouldBeThird": "Text Should Be Third",
        "ShouldBeFourth": "Text Should Be Fourth"
   }
}

And send it to main.go, to iterate each index and value, but the results is random (In my situation, I need that in sequence).

Real Case : https://play.golang.org/p/ONXEiAj-Q4v

I google why the golangs iterate in random way, and the example is using sort, but my array keys is predetermined, and sort is only for asc desc alphabet and number.

So, How can I achieve the way that arrays is not being randomize in iterate?

ShouldBeFirst = Text Should Be First
ShouldBeSecond = Text Should Be Second
ShouldBeThird = Text Should Be Third
ShouldBeFourth = Text Should Be Fourth

Anyhelp will appreciate, thanks.

golang maps does not guarantee ordered iteration https://stackoverflow.com/questions/18342784/how-to-iterate-through-a-map-in-golang-in-order — Nidhin David, Jan 23 '19 at 06:55
I think is not duplicate, thats is the key number, but i have keys is predetermined @NidhinDavid , do I have to make integer in keys of array? — Nasihun Amin Suhardiyan, Jan 23 '19 at 06:56

Charlie Tumahai · Accepted Answer · 2019-01-23T07:07:00.370

The language specification says

The iteration order over maps is not specified and is not guaranteed to be the same from one iteration to the next.

To iterate over a fixed set of keys in a known order, store those keys in a slice and iterate through the slice elements.

var orderdKeys = []string{
   "ShouldBeFirst", 
   "ShouldBeSecond",
   "ShouldBeThird",
   "ShouldBeFourth",
}

for _, k := range orderdKeys {
    fmt.Println(k+" = "+CustomSql[k])
}

Another option is to use a slice of values:

 type nameSQL struct {
   name string
   sql string
}

CustomSql := []nameSQL{
   {"ShouldBeFirst", "Text Should Be First"},
   {"ShouldBeSecond", "Text Should Be Second"},
   {"ShouldBeThird", "Text Should Be Third"},
   {"ShouldBeFourth", "Text Should Be Fourth"},
}

for _, ns := range CustomSql {
    fmt.Println(ns.name+" = "+ns.sql)
}

Ah okay i got it, so I have to work twice, first classify the arrays, and the second is order the array keys , not as simple as I thought — Nasihun Amin Suhardiyan, Jan 23 '19 at 07:03
Your alternative number two is much simpler, thanks ,im new in golang, and thank you for your knowledge — Nasihun Amin Suhardiyan, Jan 23 '19 at 07:26

How to range array in golang to not randomize predetermined key?

1 Answers1