Anything after `//` on the line is considered a comment and won't be executed.

Anything between `/*` and `*/` is considered a comment and won't be executed.

Comment is a piece of text which is ignored by the compiler or parser and they are intended for readability of the source code.

comment

Statement is a unit in source code asking for some action.

statement

basics

java

Variable is a symbolic name given to a specific location in memory to store a some value for later use.

variable

Constant is a value that cannot be changed during the execution of the program.

constant

Literal is a notation for representing a fixed atomic value specific to a Programming Language.

literal

Operator is a symbol which behave generally like a functions and usually provides an obvious operation on the data.

operations

String is a sequence of characters which based on the Programming Language they have implemented in, can have fixed or variant lengths.

string

Array is a sequence of items represented under a same name.

array

Map is a collection of items represented in key, value pairs.

data

If Else conditions provides a mechanism for performing different computations or actions depending on whether some Boolean condition evaluates to true or false.

Switch statement is a type of selection control mechanism used to control the flow of the program by searching and mapping a variable to some constants.

switch

condition

while loop is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition.

while-loop

do while loop is a control flow statement that executes a block of code at least once, and then repeatedly executes the block, or not, depending on a given Boolean condition at the end of the block.

do-while-loop

For loop is a control flow statement for specifying iteration, which allows code to be executed repeatedly.

for-loop

repeat

Function is a block of code defined to do a certain task which may get couple of inputs as parameters, do some processing and may return something.

function

Modules are chunks of code organized usually in files, and can be imported to be used again.

source-file

Namespaces are named program regions used to limit the scope of variables, functions, classes, etc inside the program.

namespace

Exception handling is a process used to change the normal flow of a program if a runtime error happens.

exception

organize-code

Class represents a set of properties (state) and methods (behaviors) that are common to all objects created from it.

class

Class Properties represent the state of the object created from that Class.

property

Class Methods are actions on objects created from that class.

method

Static properties and methods are meant to be relevant to all the instances of a class rather than to any specific instance.

static

Each Programming Language has some special methods on their Class definition. Methods like Constructors, Destructors, Getters, Setters, ... .

special-method

Inheritance is the mechanism of basing an object or class upon another object (prototype-based inheritance) or class (class-based inheritance), retaining similar implementation.

inheritance

Class Methods and Properties Visibility specifies where and how those can and cannot be accessed.

visibility

Interface is an abstraction that is used to specify a behavior that classes must implement.

interface

Polymorphism provides a mechanism that objects of different types can be accessed through the same interface.

polymorphism

Object-oriented programming is a style of coding. It focuses on modeling problems into classes and objects.

object-oriented

PHP: Hypertext Preprocessor or simply PHP, is a server scripting language generally designed for web development.

JavaScript (JS) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions.

Basics

Comment

Java

Inline Comment

Multiline Comment