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Essential Concepts
- Variables: Containers for storing data in JavaScript. Declare with
var(function-scoped),let, orconst(both block-scoped) for controlled visibility. - Data Types: Define value types for variables, like string, number, boolean, null, undefined, and object (e.g., arrays).
- Functions: Code blocks for specific tasks. Instead of repeating code, use functions like
PrintResult(rollNum)to manage repeated actions. - Loops: Run code multiple times while a condition is true, using loops like
for,while, anddo...while. - Request-Response Cycle: A client sends a request, and the server responds with resources (e.g., a webpage).
Questions and Answers
- What term allows you to run a code block multiple times as long as it is a condition?
- Loop
JavaScript Overview
JavaScript (JS) is an interpreted language that runs directly in the browser. Here’s a breakdown of key concepts in a sample JS program:
- Hello, World!: A simple log to the console.
- Variables and Data Types: Define values, e.g.,
let age = 25;. - Control Flow: Uses
ifstatements to execute different code based on conditions. - Functions: Code blocks like
greet(name)that can be reused.
