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67 lines
1.8 KiB
Go
67 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 main
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import (
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"fmt"
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"github.com/emirpasic/gods/v2/maps/treemap"
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)
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func printMap(txt string, m *treemap.Map[string, int]) {
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fmt.Print(txt, " { ")
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m.Each(func(key string, value int) {
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fmt.Print(key, ":", value, " ")
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})
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fmt.Println("}")
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}
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// EunumerableWithKeyExample to demonstrate basic usage of EunumerableWithKey
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func main() {
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m := treemap.New[string, int]()
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m.Put("g", 7)
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m.Put("f", 6)
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m.Put("e", 5)
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m.Put("d", 4)
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m.Put("c", 3)
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m.Put("b", 2)
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m.Put("a", 1)
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printMap("Initial", m) // { a:1 b:2 c:3 d:4 e:5 f:6 g:7 }
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even := m.Select(func(key string, value int) bool {
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return value%2 == 0
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})
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printMap("Elements with even values", even) // { b:2 d:4 f:6 }
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foundKey, foundValue := m.Find(func(key string, value int) bool {
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return value%2 == 0 && value%3 == 0
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})
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if foundKey != "" {
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fmt.Println("Element with value divisible by 2 and 3 found is", foundValue, "with key", foundKey) // value: 6, index: 4
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}
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square := m.Map(func(key string, value int) (string, int) {
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return key + key, value * value
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})
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printMap("Elements' values squared and letters duplicated", square) // { aa:1 bb:4 cc:9 dd:16 ee:25 ff:36 gg:49 }
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bigger := m.Any(func(key string, value int) bool {
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return value > 5
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})
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fmt.Println("Map contains element whose value is bigger than 5 is", bigger) // true
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positive := m.All(func(key string, value int) bool {
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return value > 0
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})
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fmt.Println("All map's elements have positive values is", positive) // true
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evenNumbersSquared := m.Select(func(key string, value int) bool {
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return value%2 == 0
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}).Map(func(key string, value int) (string, int) {
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return key, value * value
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})
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printMap("Chaining", evenNumbersSquared) // { b:4 d:16 f:36 }
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}
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