AllSame

Returns true if all elements in the collection have the same value, false otherwise.

• Use reflect.ValueOf() to get the array or slice, Value.Index() and Value.Interface() to get the first value.
• Use a for loop with Value.Len() and Value.Index() to iterate over each element and compare it to the search value.
• Return false if a non-matching value is found, true otherwise.

import "reflect"

func AllSame(params ...interface{}) bool {
    arr := reflect.ValueOf(params[0])
    v := arr.Index(0).Interface()

    for i := 0; i < arr.Len(); i++ {
        if arr.Index(i).Interface() != v {
            return false
        }
    }
    return true
}

AllSame([]int{1, 2, 3, 4, 5, 6}) // false
AllSame([]int{1, 1, 1, 1}) // true