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60 lines
1.8 KiB
Go
60 lines
1.8 KiB
Go
// Copyright (c) 2015, Emir Pasic. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package examples
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import (
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"fmt"
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"github.com/emirpasic/gods/sets/treeset"
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)
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func printSet(txt string, set *treeset.Set) {
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fmt.Print(txt, "[ ")
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set.Each(func(index int, value interface{}) {
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fmt.Print(value, " ")
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})
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fmt.Println("]")
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}
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// EnumerableWithIndexExample to demonstrate basic usage of EnumerableWithIndex
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func EnumerableWithIndexExample() {
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set := treeset.NewWithIntComparator()
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set.Add(2, 3, 4, 2, 5, 6, 7, 8)
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printSet("Initial", set) // [ 2 3 4 5 6 7 8 ]
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even := set.Select(func(index int, value interface{}) bool {
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return value.(int)%2 == 0
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})
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printSet("Even numbers", even) // [ 2 4 6 8 ]
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foundIndex, foundValue := set.Find(func(index int, value interface{}) bool {
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return value.(int)%2 == 0 && value.(int)%3 == 0
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})
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if foundIndex != -1 {
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fmt.Println("Number divisible by 2 and 3 found is", foundValue, "at index", foundIndex) // value: 6, index: 4
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}
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square := set.Map(func(index int, value interface{}) interface{} {
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return value.(int) * value.(int)
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})
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printSet("Numbers squared", square) // [ 4 9 16 25 36 49 64 ]
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bigger := set.Any(func(index int, value interface{}) bool {
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return value.(int) > 5
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})
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fmt.Println("Set contains a number bigger than 5 is ", bigger) // true
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positive := set.All(func(index int, value interface{}) bool {
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return value.(int) > 0
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})
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fmt.Println("All numbers are positive is", positive) // true
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evenNumbersSquared := set.Select(func(index int, value interface{}) bool {
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return value.(int)%2 == 0
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}).Map(func(index int, value interface{}) interface{} {
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return value.(int) * value.(int)
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})
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printSet("Chaining", evenNumbersSquared) // [ 4 16 36 64 ]
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}
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