Java syntax

1. Variable Declaration:

Java:

   1:      int age = 30;

   2:      String name = "John";

   3:  

C#:

   1:      int age = 30;

   2:      string name = "John";

   3:  

JavaScript:

   1:      let age = 30;

   2:      const name = "John";

   3:      var city = "New York";

   4:  

Differences:

• Java and C# are statically typed, requiring explicit type declaration.
• JavaScript is dynamically typed, allowing variable declaration without specifying the type.
• JavaScript uses `let`, `const`, and `var` for variable declaration, with `let` and `const` being block-scoped and `var` being function-scoped.

2. Data Types:

Java:

• Primitive types: int, long, float, double, boolean, char, byte, short.
• Reference types: Classes, interfaces, arrays.

C#:

• Primitive types: int, long, float, double, bool, char, byte, short, decimal.
• Reference types: Classes, interfaces, arrays, delegates.

JavaScript:

• Primitive types: number, string, boolean, null, undefined, symbol.
• Reference types: Objects, arrays, functions.

Differences:

• Java and C# have a clear distinction between primitive and reference types.
• JavaScript has a more flexible type system, with automatic type conversion.

3. Operators:

Java:

• Arithmetic: +, -, *, /, %.
• Relational: ==, !=, >, <, >=, <=.
• Logical: &&, ||, !.
• Bitwise: &, |, ^, ~, <<, >>, >>>.

C#:

• Arithmetic: +, -, *, /, %.
• Relational: ==, !=, >, <, >=, <=.
• Logical: &&, ||, !.
• Bitwise: &, |, ^, ~, <<, >>.

JavaScript:

• Arithmetic: +, -, *, /, %.
• Relational: ==, ===, !=, >, <, >=, <=.
• Logical: &&, ||, !.
• Bitwise: &, |, ^, ~, <<, >>, >>>.

Differences:

• Java and C# have similar operator sets.
• JavaScript has a unique === operator for strict equality.
• JavaScript's == operator can lead to unexpected results due to type coercion.

4. Control Flow:

5. Functions:

Java:

   1:      public int add(int a, int b) {

   2:          return a + b;

   3:      }

   4:  

C#:

   1:      public int Add(int a, int b) {

   2:          return a + b;

   3:      }

   4:  

JavaScript:

   1:      function add(a, b) {

   2:          return a + b;

   3:      }

   4:  

Differences

• Java and C# use `public` and `private` keywords for access modifiers.
• JavaScript uses `function` keyword for function declaration.
• JavaScript has a concept of "function" and "method" which are not the same.
• JavaScript has a concept of "this" which is not present in Java or C#.

6. Object-Oriented Programming (OOP):

Java:

• Class definition: class MyClass { ... }
• Inheritance: extends
• Polymorphism: Method overloading and overriding.

C#:

• Class definition: class MyClass { ... }
• Inheritance: class MyClass : BaseClass { ... }
• Polymorphism: Method overloading and overriding.

JavaScript:

• Class definition: class MyClass { ... }
• Inheritance: extends
• Polymorphism: Method overriding.

Differences:

• Java and C# have similar OOP concepts.
• JavaScript's OOP is based on prototypes, which is different from class-based inheritance.

7. Error Handling

8. More JavaScript difference

Java context:

Comments ( )