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Advanced Techniques in Go Programming

Solution 1: Composite Data Types

Explore practical solutions for using composite data types in Go. Understand how to convert 2D arrays to maps, extract keys and values into slices, and efficiently process multiple command-line arguments with pattern matching and counting results.

We'll cover the following...

Problem 1: Solution

Here’s a sample Go program that converts a 2D array into a map:

Go (1.19.0)
package main
import "fmt"
func convertToMap(arr [][]string) map[string]string {
    m := make(map[string]string)
    for _, pair := range arr {
        m[pair[0]] = pair[1]
    }
    return m
}
func main() {
    arr := [][]string{{"key1", "value1"}, {"key2", "value2"}, {"key3", "value3"}}
    mp := convertToMap(arr)
    fmt.Println(mp)
}

Code explanation

  • Lines 5–11: The convertToMap function iterates over each pair in the 2D array using a for loop, assigning the first element of the pair as the key and the second element as the value in the map m. Finally, it returns the resulting map.

  • Lines 13–17: The main function creates a 2D array of key-value pairs, arr, passes it to the convertToMap function to get a map of key-value pairs mp, and prints the resulting map to the console using the fmt.Println function.

Following is the output of the code above:

map[key1:value1 key2:value2 key3:value3]

Problem 2: Solution

Here’s a sample Go program to convert a map into two slices:

Go (1.18.2)
package main
import "fmt"
func extractKeysAndValues(inputMap map[string]int) ([]string, []int) {
	var keys []string
	var values []int
	for key := range inputMap {
		keys = append(keys, key)
		values = append(values, inputMap[key])
	}
	return keys, values
}
func main() {
	originalMap := map[string]int{
		"first":  1,
		"second": 2,
		"third":  3,
	}
	keys, values := extractKeysAndValues(originalMap)
	fmt.Println("Keys:", keys)
	fmt.Println("Values:", values)
}

Code explanation

  • Lines 5–15: The ...