Data Structures

Arrays

Java

String cars[] = new String[5] { "Toyota", "Mercedes", "BMW", "Volkswagen", "Skoda" };

System.out.println(cars[0]); // Toyota

GoLang

cars := [5]string{"Toyota", "Mercedes", "BMW", "Volkswagen", "Skoda"}

fmt.Println(cars[0]) // Toyota

For-each over an array

Java

for (String car : cars) {
    System.out.println(strTemp);
}

GoLang

for _, car := range cars {
	fmt.Println("My car is: ", car)
}

Multidimensional array

Java

String langs[][] = new String[][]{{"C#", "C", "Python"},
                   {"Java", "Scala", "Perl"}, 
                   {"C++", "Go", "HTML"}};

GoLang

langs := [3][3]string{{"C#", "C", "Python"},
                   {"Java", "Scala", "Perl"},
                   {"C++", "Go", "HTML"}}

For-each over a multi-dimensional array

Java

for (String[] arr : langs) {
  for (String lang : arr) {
    System.out.println(lang + " ");
  }
  System.out.println();
}
//  C# C Python
//  Java Scala Perl
//  C++ Go HTML

GoLang

for _, v := range langs {
    for _, lang := range v {
       fmt.Print(lang, " ")
    }
    fmt.Println()
}
//  C# C Python
//  Java Scala Perl
//  C++ Go HTML

List/slice

Java

List<String> letters = List.of("a", "b", "c", "d");

letters.add("e");

int length = letters.size();

GoLang

letters := []string{"a", "b", "c", "d"}

letters = append(letters, "e")

length := len(letters)

For-each over a list/slice

Java

letters.forEach(value => System.out.println(value));

GoLang

for _, letter := range letters {
	fmt.Println(letter)
}

Maps

Java

Map<String, String> mapA = Map.of("key1", "element1");

mapA.put("key2", "element2");

mapA.remove("key2")

if (mapA.contains("key1")) {
    System.out.println(mapA.get("key1")); // element2
}

GoLang

mapA := map[string]string{"key1":"element1"}

mapA["key2"] = "element2"

delete(mapA, "key2")

if value, ok = mapA["key1"]; ok == true {
	mapA["key1"] // element2
}

For-each over a map

Java

mapA.forEach((key, value) -> System.out.println(k + ":" + v));

GoLang

for key, value := range mapA {
	fmt.Println(key + ":" + value)
}