83 lines
1.6 KiB
Go
83 lines
1.6 KiB
Go
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"fmt"
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"strings"
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"unicode"
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)
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type filterFunc func(int) bool
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func main() {
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signatures()
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fmt.Println("\n••• WITHOUT FUNC VALUES •••")
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nums := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
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fmt.Printf("evens : %d\n", filterEvens(nums...))
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fmt.Printf("odds : %d\n", filterOdds(nums...))
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fmt.Println("\n••• FUNC VALUES •••")
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fmt.Printf("evens : %d\n", filter(isEven, nums...))
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fmt.Printf("odds : %d\n", filter(isOdd, nums...))
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fmt.Println("\n••• MAPPING •••")
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fmt.Println(strings.Map(unpunct, "hello!!! HOW ARE YOU???? :))"))
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fmt.Println(strings.Map(unpunct, "TIME IS UP!"))
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}
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func unpunct(r rune) rune {
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if unicode.IsPunct(r) {
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return -1
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}
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return unicode.ToLower(r)
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}
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func filter(f filterFunc, nums ...int) (filtered []int) {
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for _, n := range nums {
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if f(n) {
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filtered = append(filtered, n)
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}
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}
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return
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}
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func filterOdds(nums ...int) (filtered []int) {
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for _, n := range nums {
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if isOdd(n) {
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filtered = append(filtered, n)
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}
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}
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return
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}
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func filterEvens(nums ...int) (filtered []int) {
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for _, n := range nums {
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if isEven(n) {
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filtered = append(filtered, n)
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}
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}
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return
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}
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func isEven(n int) bool {
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return n%2 == 0
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}
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func isOdd(m int) bool {
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return m%2 == 1
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}
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func signatures() {
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fmt.Println("••• FUNC SIGNATURES (TYPES) •••")
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fmt.Printf("isEven : %T\n", isEven)
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fmt.Printf("isOdd : %T\n", isOdd)
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}
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