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The Way to Go

Solution Review: Filter Even and Odd Numbers

Explore how to write and use functions in Go to filter slices of integers into even and odd categories. Understand type aliasing for function types and how to pass functions as parameters. Gain practical experience with function declarations, return values, and slice manipulation in Go.

We'll cover the following...
Go (1.6.2)
package main
import "fmt"
type flt func(int) bool // aliasing type
func isEven(n int) bool { // check if n is even or not
    if n % 2 == 0 {
        return true
    }
    return false
}
func filter(sl[] int, f flt)(yes, no[] int) { // split s into two slices: even and odd
    for _, val := range sl {
        if f(val) {
            yes = append(yes, val)
        } else {
            no = append(no, val)
        }
    }
    return
}
func main() {
    slice := [] int {1, 2, 3, 4, 5, 7}
    fmt.Println("slice = ", slice)
    even,odd := filter(slice, isEven)
    fmt.Println("The even elements of slice are: ", even)
    fmt.Println("The odd elements of slice are: ", odd)
}

The program above has one basic function. The function isEven takes n as a parameter and returns a boolean value (see its header at line6). If n is even, it will return true; otherwise, it will return false. At line 4 ...