Introduction to JavaScript

JavaScript is a high-level, often just-in-time compiled language that conforms to the ECMAScript specification. It is a dynamic language with prototype-based object-orientation and first-class functions.

JavaScript Basics

Here are some of the basic concepts of JavaScript:

• Variables: Variables are used to store data values. In JavaScript, variables are declared using the var, let, or const keywords.

  var age = 30;
  let name = "John";
  const pi = 3.14;
  

• Data Types: JavaScript has several data types, including strings, numbers, objects, arrays, and more.

  • String: A string is a sequence of characters.

    let message = "Hello, world!";
    

  • Number: A number is a value representing a quantity.

    let count = 5;
    

  • Array: An array is a list of values.

    let fruits = ["apple", "banana", "cherry"];
    

  • Object: An object is a collection of key-value pairs.

    let person = {
      name: "John",
      age: 30,
      profession: "Developer"
    };
    

• Control Structures: Control structures allow you to control the flow of execution in your code.

  • If/Else: The if/else statement allows you to execute a block of code if a specified condition is true, and another block of code if the condition is false.

    if (age > 18) {
      console.log("You are an adult.");
    } else {
      console.log("You are not an adult.");
    }
    

  • For Loop: The for loop allows you to execute a block of code repeatedly.

    for (let i = 0; i < 5; i++) {
      console.log(i);
    }
    

Learning Resources

To learn more about JavaScript, you can visit our JavaScript tutorials.

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