Here are the 30 common SQL queries with examples. These cover a wide range of database operations from basic to more advanced. Basic SELECT Queries Filtering and Conditions Aggregations and Grouping Joins Subqueries Data Modification Advanced Queries These queries cover the most common operations you’ll need when working with SQL databases. Each example can be… Read More »
Introduction A well-designed image carousel can greatly enhance the user experience in Flutter apps. In this article, we will create a **beautiful and interactive image slider** using **CarouselController**. We’ll add smooth animations, navigation buttons, and loading indicators to improve usability. Prerequisites To follow along, make sure you have Flutter installed. If you haven’t set it… Read More »
Video Tutorial Here is the first part of best practices in Flutter… 1. Placeholder Widgets Use SizedBox instead of Container as Placeholder widgets. Take a look at the below use-case The SizedBox is a const constructor and creates a fixed-size box. The width and height parameters can be null to indicate that the size of the box should not… Read More »
Wrap widget is such a useful widget in many circumstances. Here we will learn about different types of Chip Widgets such as & Wrap Widgets Watch Video Tutorial First Let’s create a simple Chip Widget. Widget chip(String label, Color color) { return Chip( labelPadding: EdgeInsets.all(5.0), avatar: CircleAvatar( backgroundColor: Colors.grey.shade600, child: Text(label[0].toUpperCase()), ), label: Text( label, style:… Read More »
This post provides a step-by-step guide to implementing a carousel slider in Flutter using a custom CarouselView widget. The code demonstrates how to display a horizontal carousel of images with various customization options. Demo Full code Example import ‘package:flutter/material.dart’;List<String> images = [ “https://images.unsplash.com/photo-1503376780353-7e6692767b70”, “https://images.unsplash.com/photo-1577714141096-bf2b9e69500a”, “https://images.unsplash.com/photo-1542362567-b07e54358753”, “https://images.unsplash.com/photo-1511407397940-d57f68e81203”, “https://images.unsplash.com/photo-1659671026913-b7e632f17395”];class Home extends StatefulWidget { const Home({super.key}); @override State<Home>… Read More »
A ternary search tree is a trie-like data structure where each node may have up to three children. Here is an example which represents the words code, cob, be, ax, war, and we. c / | \ b o w / | | | a … Read More »
Feature OpenAI o1 Google Gemini 2.0 xAI Grok-2 Meta Llama 3.3 Nvidia Nemotron-4 340B Developer OpenAI Google xAI (Elon Musk’s startup) Meta Nvidia Release Date December 2024 December 2024 December 2024 December 2024 December 2024 Key Focus Problem-solving, STEM, competitive programming Efficiency, advanced reasoning Integration with X (formerly Twitter) Open research, accessible to developers Open… Read More »
Flutter 3.27, released in December 2024, introduces several enhancements across the framework, engine, and developer tools, aiming to improve performance, user interface components, and the overall development experience. Framework Enhancements: • Cupertino Widget Updates: Significant improvements have been made to Cupertino widgets to better align with iOS design standards: • CupertinoCheckbox and CupertinoRadio: Enhanced sizes,… Read More »
In Flutter, Streams are a powerful way to handle asynchronous data like file downloads. When downloading a file, streams can help you process chunks of data in real time, making it easy to show progress to the user. Here’s a step-by-step guide on how to download a file using streams in Flutter. Add Required Dependencies… Read More »
A step word is formed by taking a given word, adding a letter, and anagramming the result. For example, starting with the word “APPLE”, you can add an “A” and anagram to get “APPEAL”. Given a dictionary of words and an input word, create a function that returns all valid step words. To solve the… Read More »
Watch Video Tutorial Using Simple Timer Create a simple debouncer class Implementation: Using ValueNotifier Implementation: Using “Simple Debouncer” package First Add easy_debouncer package in your dependencies https://pub.dev/packages/easy_debounce Source Code https://github.com/MrVipinVijayan/flutter_tutorials/tree/feat/debounce
To find the minimum element in a rotated sorted array in O(logN)O(\log N)O(logN) time, you can use a modified binary search approach. The key observation is that even though the array is rotated, one part of the array will still be in sorted order. By comparing elements in the middle of the array with the… Read More »
The word can be constructed from letters of sequentially adjacent cell, where “adjacent” cells are those horizontally or vertically neighboring. The same letter cell may not be used more than once. For example, given the following board: exists(board, “ABCCED”) returns true, exists(board, “SEE”) returns true, exists(board, “ABCB”) returns false. Python def exist(board, word): if not board: return False … Read More »
Java: Javascript Python: Asked by: Google
The first few sevenish numbers are 1, 7, 8, 49, and so on. Create an algorithm to find the nth sevenish number. JAVA JAVASCRIPT
For example, given [100, 4, 200, 1, 3, 2], the longest consecutive element sequence is [1, 2, 3, 4]. Return its length: 4. Algorithm should run in O(n) complexity. JAVA JAVASCRIPT PYTHON
In Swift, optionals are a powerful feature that allows variables or constants to have a value or be nil, indicating the absence of a value. Optionals are represented using the Optional type, which is an enumeration with two cases: Some(Wrapped) to represent a value, and nil to represent the absence of a value. Here are… Read More »
Recall that a heap has the following operations: To implement a stack using only a heap, you can use a max heap and maintain a counter to ensure that the order of elements is preserved. Here’s an example implementation in Python, Java, and JavaScript using the heapq module (Python), PriorityQueue (Java), and BinaryHeap (JavaScript): Python:… Read More »
For example, given the following preorder traversal: [a, b, d, e, c, f, g] And the following inorder traversal: [d, b, e, a, f, c, g] You should return the following tree: To reconstruct a binary tree from its pre-order and in-order traversals, you can use a recursive approach. The idea is to select the… Read More »
In Ruby, exception handling is done using the begin, rescue, else, and ensure blocks. Here’s a basic structure of a begin-rescue block: Let’s break down the components: Example with a specific exception: In this example: As with any language, it’s good practice to catch only the exceptions you expect and handle them appropriately. Avoid catching… Read More »
Exception handling in Python is done using the try, except, else, and finally blocks. Here’s a basic structure of a try-except block: Let’s break down the components: Example with a specific exception: In this example: You can customize exception handling based on the specific requirements of your code. It’s generally a good practice to catch… Read More »
In Python, a namespace is a container that holds a set of names (identifiers) and their corresponding objects. It serves as a mapping between names and objects, allowing you to organize and manage the scope of variables, functions, classes, and other identifiers in your code. Namespaces help avoid naming conflicts and provide a way to… Read More »
Given a string of parentheses, find the balanced string that can be produced from it using the minimum number of insertions and deletions. If there are multiple solutions, return any of them. For example, given “(()”, you could return “(())”. Given “))()(“, you could return “()()()()”. To find the balanced string with the minimum number… Read More »
In Swift, inout is a keyword used to indicate that a parameter is passed by reference and can be modified inside a function, affecting the original value outside the function. This allows a function to modify the value of the parameter and have those changes reflected in the calling scope. Here’s an example to illustrate… Read More »
In SwiftUI, you can create a path with a custom shape by using the Path and Shape types. Here’s a basic example of how to create a custom path with a shape in SwiftUI: In this example: You can modify the path(in:) function to create different custom shapes based on your requirements. SwiftUI provides a… Read More »