77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
// 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 "fmt"
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type filterFunc func(int) bool
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func main() {
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nums := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
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fmt.Println("••• 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.Printf("> 3 : %d\n", filter(greaterThan3, nums...))
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fmt.Printf("> 6 : %d\n", filter(greaterThan6, nums...))
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// ========================================================================
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fmt.Println("\n••• CLOSURES •••")
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var min int
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greaterThan := func(n int) bool {
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return n > min
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}
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min = 3
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fmt.Printf("> 3 : %d\n", filter(greaterThan, nums...))
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min = 6
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fmt.Printf("> 6 : %d\n", filter(greaterThan, nums...))
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// min = 1
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// fmt.Printf("> 1 : %d\n", filter(greaterThan, nums...))
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// min = 2
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// fmt.Printf("> 2 : %d\n", filter(greaterThan, nums...))
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// min = 3
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// fmt.Printf("> 3 : %d\n", filter(greaterThan, nums...))
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var filterers []filterFunc
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for i := 1; i <= 3; i++ {
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current := i
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filterers = append(filterers, func(n int) bool {
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min = current
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return greaterThan(n)
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})
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}
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printer(filterers, nums...)
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}
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func printer(filterers []filterFunc, nums ...int) {
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for i, filterer := range filterers {
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fmt.Printf("> %d : %d\n", i+1, filter(filterer, nums...))
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}
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}
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func greaterThan6(n int) bool { return n > 6 }
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func greaterThan3(n int) bool { return n > 3 }
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func isEven(n int) bool { return n%2 == 0 }
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func isOdd(m int) bool { return m%2 == 1 }
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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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