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PlanetPython

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PyCoder��s Weekly: Issue #661 (Dec. 24, 2024)

Exploring Modern Sentiment Analysis Approaches in Python
Topological Sort
Essential Python Web Security
Quiz: How to Remove Items From Lists in Python

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Medium

121

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5 Common mistakes in Coding

Mistake 1: Not Fully Understanding the Basics
Mistake 2: Jumping into Complex Projects Too Soon
Mistake 3: Copying Code Without Understanding It
Mistake 4: Fear of Asking for Help
Mistake 5: Giving Up Too Quickly

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Dev

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Getting Started with Java: Problem-Solving for Beginners

Before diving into the concept of operators in Java, it’s essential to practice with simple problem-solving examples.
This article covers basic yet practical problems such as adding two numbers, checking even or odd, and calculating the factorial of a number.
The examples provide explanations and code snippets to help understand the solutions.
The next blog will explore operators in Java and guide readers on building a calculator.

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Dev

112

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Synthetic Testing: WTH Is It?

Synthetic testing, also known as synthetic monitoring or proactive monitoring, is a way to identify performance issues with key user journeys by simulating real user traffic.
At its heart, Synthetic Testing is all about automation. It involves browsers visiting specific web pages, performing actions, and ensuring everything works as it should.
Synthetic Testing goes beyond just checking if something works. It measures network performance, frontend performance, and provides insights into how well tasks are completed.
The advantages of Synthetic Testing include comprehensive problem discovery, early problem detection, scalability, and performance insights.

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Dev

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What is 'useCallback' in React?

useCallback is a React Hook that helps optimize components by memoizing callback functions, ensuring the function reference stays the same unless dependencies change.
It prevents unnecessary re-renders or re-executions of child components' useEffect hooks when passing functions as props to child components.
useCallback syntax: const memoizedCallback = useCallback(() => { // Your logic here }, [dependencies]);
It is commonly used when passing functions as props to child components, optimizing performance and preventing expensive computations caused by frequent re-creation of the same function.

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Dev

428

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Concurrency Patterns: Balking Pattern

The Balking Design Pattern is a behavioral design pattern used to manage state-dependent actions in a system.
The Balking Pattern relies on three fundamental concepts: Guard Condition, State-Dependent Actions, and Thread Safety.
The Balking Pattern can be used in multithreaded systems, state-dependent workflows, and resource management scenarios.
Advantages of the Balking Pattern include preventing invalid operations, providing thread safety, and simplifying logic.

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Dev

190

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Streamlining Restaurant Inventory Management: Challenges and Solutions

Managing inventory in a restaurant can be challenging.
A streamlined workflow was developed to address inventory challenges.
The workflow includes supplier and manufacturer registration.
Recipe registration helps track ingredient usage and calculate average yield.

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Medium

How I Reduced a Flutter App’s Size from 158MB to 56MB

The author reduced a Flutter app's size from 158MB to 56MB.
The author realized that the large size was costing users time, data, and storage space.
The author used a tool to identify the largest contributors to the app's size.
The author implemented various optimizations, resulting in a significant reduction in app size.

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Dev

368

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[Part 2] A Brief Introduction to SOLID Typescript

Interface Segregation Principle (ISP): Clients should not be forced to implement interfaces they do not use.
Dependency Inversion Principle (DIP): High-level modules should not depend on low-level modules. Both should depend on abstractions.
In ISP, interfaces should be small and specific to the needs of the implementing class.
In DIP, high-level modules should depend on abstractions (interfaces), and low-level modules should implement those abstractions.

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Medium

129

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Spring Boot and JPA Integration Explained

Java Persistence API (JPA) makes working with data at a higher level of abstraction easier.
JPA is not an implementation but a specification, and Hibernate is often the default implementation used with Spring Boot and JPA.
Spring Boot's integration with JPA includes several convenient features that simplify database integration details.
Entity mapping is automated through the use of annotations which are part of the JPA specification.
JPA allows embedding non-entity objects within entities using the @Embeddable and @Embedded annotations.
Spring Boot automatically handles entity states of transient, persistent, detached, and removed during interaction with the database.
Session management in JPA is managed through integration with the application context and transaction handling mechanisms in Spring Boot.
Transactions in JPA are grouped into a single unit of work in Spring Boot by managing through the @Transactional annotation.
Spring Data JPA abstracts common database operations through repositories, providing built-in methods for CRUD operations.
JPA supports two loading strategies for fetching associated entities: lazy loading and eager loading.Spring Boot supports queries using JPQL and native SQL.

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Prodevelopertutorial

Given a set of distinct integers, nums, return all possible subsets (the power set).

The problem is to find all possible subsets (power set) of a given set of distinct integers.
An iterative solution involves using two loops to add elements iteratively.
A backtracking solution uses recursion to generate subsets.
For the input [1, 2, 3], the output subsets are [[], [1], [2], [1, 2], [3], [1, 3], [2, 3], [1, 2, 3]].

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Medium

General Overview :Time Value Function

Present value (PV) is the dollar amount now of a sum expected to be received or paid in the future, adjusted for a specified interest rate.
Future value (FV) is the dollar sum that an amount will grow into at a specified point in time, given a specific interest rate.
Interest rate (r) refers to the rate at which money accrues over a certain period of time, whether simple or compound.
Period of time (n) is the duration for which money has been lent or borrowed.

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Dev

246

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❄️Introducing the HMPL Template Language

HMPL is a template language for server-side rendering (SSR) for web applications.
It allows loading components to the client directly from the server with customization.
HMPL can be used to share components between sites and reduce client-side code.
The article emphasizes the importance of learning to program and the potential of HMPL.

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Dev

428

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Coding Myths Debunked: Things Beginners Should Stop Believing

The world of programming is filled with misconceptions, especially for beginners. Let’s debunk some of the most common coding myths and provide practical advice for aspiring developers.
Myth #1: 'You need to be a math genius to code.' - The Reality: Most everyday programming tasks require only basic arithmetic or logic. Focus on problem-solving and logical thinking.
Myth #2: 'JavaScript is enough for everything.' - The Reality: Different projects require different tools. Learn the basics of JavaScript but explore other languages based on your interests and career goals.
Myth #3: 'You have to start coding as a teenager to succeed.' - The Reality: People can start coding at any age and still build successful careers. Focus on practical skills and projects.

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Prodevelopertutorial

346

Sort Colors In Place

The problem here is ‘sort an array of 0s, 1s and 2s’ when given an array of unsorted 0’s, 1’s and 2’s. We can solve this problem in an integer array by simple counting the number of 0’s, 1’s, and 2’s present in the array and placing them again each other , which is also called Counting Sort
In this solution, we take 3 variables [n0, n1, n2] and set them to “-1”. We start iterating from the first element of the array. If the element is “0” then increment the index of all the 3 variables [n0, n1, n2], and place the appropriate value.
If the element is “1” then increment the index of 2 variables [n1, n2], and place the appropriate value. If the element is “2” then increment the index of n2, and place the appropriate value.
In another solution, we take 3 pointers low, mid, high. From the input, we know that mid is “1”, and the elements lesser than mid will be swapped to the left of mid, and the elements greater than mid, will be pushed to the right of mid.
This solution can also be solved using Dutch National Flag Algorithm, which maintains 3 pointers - low, mid and high and swaps the values according to their values without using any if-else statements or extra memory space.
Sorting an array of 0's, 1's and 2's is a classical computer science problem and is popularly called the Dutch national flag problem.
The solution can be implemented using simple techniques like counting the number of 0’s, 1’s, and 2’s; In-place method using 3 pointers and another using Dutch national flag algorithm.
All the techniques are optimal solutions to the problem and take linear time to sort the array.
Given an array of size n containing only 0s, 1s, and 2s; sort the array in ascending order.
Return the sorted array. You are not allowed to use sorting libraries.

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