Module 6 Complete

Author: subhash-kr0

Module 6 - The JavaScript Standard Library/JS_StandardLibrary.md

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+# The JavaScript Standard
+
+JavaScript provides a rich standard library that empowers developers to work with data structures, patterns, APIs, and more. Here's an overview of key concepts and tools.
+
+---
+
+## Sets and Maps
+### Sets
+- A `Set` is a collection of unique values.
+- Example:
+
+```javascript
+let set = new Set([1, 2, 3, 3]);
+console.log(set); // Set(3) {1, 2, 3}
+```
+- Common methods: `add()`, `delete()`, `has()`, `clear()`.
+
+### Maps
+- A `Map` is a collection of key-value pairs.
+- Example:
+
+```javascript
+let map = new Map();
+map.set('key', 'value');
+console.log(map.get('key')); // 'value'
+```
+- Common methods: `set()`, `get()`, `delete()`, `has()`, `clear()`.
+
+---
+
+## Typed Arrays and Binary Data
+Typed arrays provide efficient handling of binary data.
+- Example:
+
+```javascript
+let buffer = new ArrayBuffer(16);
+let int32View = new Int32Array(buffer);
+int32View[0] = 42;
+console.log(int32View[0]); // 42
+```
+- Key classes: `ArrayBuffer`, `Uint8Array`, `Float32Array`.
+
+---
+
+## Pattern Matching with Regular Expressions
+Regular expressions are powerful tools for pattern matching and string manipulation.
+- Example:
+
+```javascript
+let regex = /\d+/g;
+let matches = '123 abc 456'.match(regex);
+console.log(matches); // ['123', '456']
+```
+- Flags: `g` (global), `i` (case-insensitive), `m` (multiline).
+
+---
+
+## Dates and Times
+The `Date` object handles date and time.
+- Example:
+
+```javascript
+let now = new Date();
+console.log(now.toISOString());
+```
+- Methods: `getFullYear()`, `getMonth()`, `getDate()`, `getTime()`.
+
+---
+
+## Error Classes
+Custom error classes extend JavaScript's built-in error handling.
+- Example:
+
+```javascript
+class CustomError extends Error {
+    constructor(message) {
+        super(message);
+        this.name = 'CustomError';
+    }
+}
+throw new CustomError('Something went wrong');
+```
+
+---
+
+## JSON Serialization and Parsing
+Convert data to/from JSON format.
+- Example:
+
+```javascript
+let obj = { key: 'value' };
+let json = JSON.stringify(obj);
+console.log(JSON.parse(json));
+```
+
+---
+
+## The Internationalization API
+Format numbers, dates, and strings for international contexts.
+- Example:
+
+```javascript
+let number = 123456.789;
+let formatted = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD' }).format(number);
+console.log(formatted); // $123,456.79
+```
+
+---
+
+## The Console API
+Provides tools for debugging and logging.
+- Example:
+
+```javascript
+console.log('Log message');
+console.warn('Warning message');
+console.error('Error message');
+```
+
+---
+
+## URL APIs
+Manipulate URLs programmatically.
+- Example:
+
+```javascript
+let url = new URL('https://example.com?key=value');
+console.log(url.searchParams.get('key')); // 'value'
+```
+
+---
+
+## Timers
+Execute code after a delay or repeatedly.
+- Example:
+
+```javascript
+setTimeout(() => console.log('Hello after 1 second'), 1000);
+let interval = setInterval(() => console.log('Repeating every second'), 1000);
+clearInterval(interval);
+```
+
+---
+
+With these tools, JavaScript provides robust capabilities for building modern web applications.
+