[go-nuts] Repeated functions with the same output in loops

[mustafa katipoğlu]

If I use len() function inside of a foor loop , does it calculates the 
output each time? or if the output will be the same(like arrays) will it 
calculates the length of the function again ?

var letterRunes = 
[]rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_")


b := make([]rune, usernameLength)


for i := range b {
   b[i] = letterRunes[rand.Intn(len(letterRunes))]
}



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