40 lines
1 KiB
Go
40 lines
1 KiB
Go
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package main
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import (
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"fmt"
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"reflect"
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)
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func main() {
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fmt.Println("Range form of the for loof iterates over a slice or map")
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fmt.Println("When ranging over a slice, two values are returned for each iteration. The first is the index, and the second is a copy of the element at that index")
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var primes = []int{2, 3, 5, 7, 11, 13, 17}
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fmt.Printf("%p, %p, %p, %p\n", &primes, primes, &primes[0], &primes[1])
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fmt.Printf("%s, %s, %s\n\n", reflect.TypeOf(primes).Kind(), reflect.TypeOf(&primes).Kind(), reflect.TypeOf(&primes[0]).Kind())
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for i, v := range primes {
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fmt.Printf("%d: %d\n", i, v)
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fmt.Printf("POINTER: %p\n\n", &v) // v is just a copy !!!
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v = 10 // This line has NO impact
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}
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fmt.Println(primes)
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fmt.Printf("\n\n")
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fmt.Println("You can skip the index OR value by assigning to _")
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// for i, _ := range varname
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// for _, value := range varname
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pow := make([]int, 10)
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for i := range pow { // i is INDEX here! not value of pow!!!
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pow[i] = 1 << i
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}
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for _, value := range pow {
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fmt.Printf("%d\n", value)
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}
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}
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