- Variables are used to store data that can be referenced and manipulated in a program. Each variable has a data type, which determines what kind of data it can hold (e.g., numbers, text).
- Examples:
int,float,string,boolean.
- Examples:
- Conditionals allow the program to make decisions based on certain conditions.
- Example:
if,else,switch.
- Example:
- Loops are used to repeat a block of code multiple times.
- Example:
for,while,do-while.
- Example:
- Functions are reusable blocks of code that perform a specific task. They can take parameters (inputs) and return a value (output).
- Example:
function add(a, b) { return a + b; }
- Example:
- Objects are collections of data (attributes) and functions (methods) that are related. They are instances of classes.
- A class defines the blueprint for creating objects.
- Example (Object-Oriented Programming):
class Car { constructor(make, model) { this.make = make; this.model = model; } }
- Example (Object-Oriented Programming):
- Arrays are ordered lists of elements that can be accessed using an index.
- Example:
let fruits = ["apple", "banana", "cherry"];
- Example:
- Collections (e.g., lists, sets, dictionaries) are more advanced structures for grouping data.
- Example:
Map,Set,List(varies by language).
- Example:
- Algorithms are step-by-step procedures for solving problems or performing tasks.
- Data structures define ways to store and organize data for efficient access and modification.
- Examples: linked lists, stacks, queues, trees, graphs.
- Recursion occurs when a function calls itself to solve a problem. It’s useful for problems that can be broken down into smaller, similar problems.
- Example: Calculating the factorial of a number:
factorial(n) = n * factorial(n-1).
- Example: Calculating the factorial of a number:
- Concurrency allows a program to handle multiple tasks at once, while parallelism involves executing multiple tasks simultaneously to speed up execution.
- Concepts include threads, asynchronous programming, and promises.
- Exceptions are runtime errors that can disrupt the normal flow of a program. Error handling allows the program to respond to errors without crashing.
- Example:
try-catchblocks (in many programming languages).
- Example:
- Understanding how a program allocates and deallocates memory is crucial for efficiency and avoiding memory leaks.
- Concepts like garbage collection (automatic memory management) and manual memory allocation in lower-level languages (e.g., C).
- Version control systems track changes in code over time, making it easier to collaborate and revert to earlier versions if needed.
- Example: Git, GitHub, Bitbucket.
- Design patterns are reusable solutions to common software design problems. They help improve code structure and readability.
- Examples: Singleton, Factory, Observer, Strategy.
- Testing ensures the code works as expected and meets requirements. Types include unit testing, integration testing, and end-to-end testing.
- Debugging is the process of identifying and fixing errors or bugs in the code.
- APIs define how different software components communicate with each other, allowing developers to interact with external services or libraries.
- Example: RESTful APIs, GraphQL.
- Frameworks provide a structured foundation for building applications, while libraries offer specific functionality or tools to simplify development.
- Examples: React, Django, Express.
- Security is critical in software development, protecting applications from threats such as data breaches, injections, and other vulnerabilities.
- Practices include encryption, input validation, and authentication mechanisms like OAuth.
- In event-driven programming, code execution is driven by events such as user actions (clicks, keystrokes) or messages from other programs.
- Examples: JavaScript in browsers, Node.js applications.