For循环以其主体结尾

Question

For loop ends with its body and dont go furter

I need find wIndex, check if its in the slice, if no add value Where I go wrong?

var x make(map[int]float32, 10)
var s []int
var value = 100
for i := 1; i <= 10; i++ {
    wIndex := int(rand.Intn(len(x))) // random Index choice among map values
    for _, v := range s {            //end of loop here (if exactly it returnts to loop before)
        if v != wIndex {
            s = append(s, wIndex)
            x[wIndex] += value
        }
    }
}

Answer 1

You start with an empty s slice. So you will never enter your inner for loop where you add elements to the slice.

Here is an alternative and straight forward way to do it:

for i := 1; i <= 10; i++ {
    wIndex := int(rand.Intn(len(x) + 1)) 
    found := false
    for _, v := range s {
        if v == wIndex {
            found = true
            break
        }
     }
     if !found {
        s = append(s, wIndex)
        x[wIndex] += float32(value)
     }
 }

• note that you need to convert the value to a float32, so x[wIndex] += float32(value) instead of just x[wIndex] += value

• rand.Intn(n int) generates numbers in the range [0,n), so you need to add 1 to cover the proper range, and avoid panic when the map is empty.