Javascript Notes Pdf Ameerpet [best] Jun 2026

: Writing if , else , and switch blocks to make choices. 2. Functions and Objects

let course = "JS"; switch (course) case "HTML": console.log("Duration: 1 Week"); break; case "JS": console.log("Duration: 3 Weeks"); break; default: console.log("Invalid Course"); Use code with caution.

Written in a separate file with a .js extension and linked to the HTML file. This keeps code clean and reusable. Use code with caution. javascript // script.js console.log("Hello from External JS!"); Use code with caution. Output Mechanisms JavaScript provides different ways to display data: javascript notes pdf ameerpet

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// Scope demonstration function scopeTest() if (true) var x = "I am function scoped"; let y = "I am block scoped"; console.log(x); // Works perfectly // console.log(y); // ReferenceError: y is not defined scopeTest(); Use code with caution. JavaScript Data Types : Writing if , else , and switch blocks to make choices

Used to handle asynchronous operations (like API calls). A Promise has three states: , Resolved , Rejected .

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Ameerpet interview questions frequently test the practical difference between functional array methods.

let j = 1; do console.log(j); j++; while (j <= 0); // Condition is false, but code runs once Use code with caution. Module 4: Functions and Scope

// Filter Example let evens = nums.filter(n => n % 2 === 0); // [2, 4]

JavaScript is single-threaded, meaning it can execute only one command at a time. However, it handles highly asynchronous tasks (like API requests and timers) using the Web API environment, Call Stack, Callback Queue, and the Event Loop. The Event Loop Architecture Executes synchronous code line-by-line.