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Understanding DOM Manipulation in JavaScript: A Beginner’s Guide

DOM manipulation enables dynamic interaction with web pages, transforming static content into interactive experiences.
The Document Object Model (DOM) is a programming interface for web documents, representing the structure of an HTML document as a tree of objects.
Learning DOM manipulation allows for updating content, adding interactive features, and handling events.
Methods such as getElementById, getElementsByClassName, getElementsByTagName, and querySelector are used to access elements in the DOM.

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Alvinashcraft

117

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Dew Drop – January 17, 2025 (4344)

Our Favorite NEW Visual Studio Features of 2024 (Jason Chlus)
Fine-Tuning and Deploying Phi-3.5 Model with Azure and AI Toolkit (Sharda Kaur)
AI Transformations for Sustainability (Brad Smith & Melanie Nakagawa)
The Hanselminutes Podcast – The Quantum Advantage with Dr Krysta Svore (Scott Hanselman)

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Prodevelopertutorial

234

Matrix: Find a row with maximum number of 1’s in a binary matrix

You are given a m*n binary matrix, you need to find a row that has maximum number of 1’s in it.
Two approaches to solve this problem: Brute force approach and Binary Search approach.
Brute force approach: Traverse the matrix row by row and count the number of 1s in each row. Return the row with the maximum number of 1s.
Binary Search approach: Since each row is sorted, use binary search to find the first instance of 1 in each row. Return the row with the maximum number of 1s.

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Prodevelopertutorial

293

Arrays: Find the median of 2 sorted arrays of same size

The problem requires finding the median of two sorted arrays of the same size.
The median is the middle element that separates the higher half from the lower half.
The solution involves comparing the values of the two arrays using a simple approach.
By merging the arrays and finding the elements in the middle, the median can be computed.

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Prodevelopertutorial

Arrays: Get minimum number of merge operations to make an array palindrome

You are given an array, you need to find the minimum number of merge operations to be performed to make the array as a palindrome.
The solution involves using two pointers, one pointing to the beginning of the array and the other pointing to the end of the array.
Based on the comparison of elements at the two pointers, three cases are defined along with the required steps for each case.
The C++ code provided demonstrates the implementation of the solution using a loop and the defined cases.

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PlanetPython

437

Fabio Zadrozny: Using (or really misusing) Path.resolve() in Python

Python Path.resolve(), which resolves symlinks and substs on Windows could be causing bugs in certain cases.
If a user crafted a structure with symlink which isn't the canonical representation, resolve() will not find it.
In python docs, it is recommended to use Path.resolve() to walk up an arbitrary filesystem path.
However, it leads to incorrect parent resolutions. Instead, using os.path.normalize and os.path.abspath() will suffice.
Using os.path.normalize(os.path.abspath(...)) will eliminate instances of ‘..’ from the string and make it absolute.
A bug can occur when calls to absolute() or resolve() are made from two programs with different current working directories.
Path.resolve() can be useful in maping out an IDE cache where all representation of a file are considered the same.
Ideally, it's best to use the inode of the file as reference, since bugs can occur which result in the same file being opened under different names.
In case of executing an API call from another program, paths should already be absolute and normalized.
It is best practice to call Path(os.path.normalize(os.path.abspath(...))) on program boundaries.

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Prodevelopertutorial

207

Arrays: Minimum swaps required to bring all elements less than or equal to k together

Given an array and a number K, find the minimum number of swaps needed to bring all the numbers less than K together.
The problem can be solved using the sliding window approach.
First, count the elements that are less than or equal to K.
Then, find the minimum number of elements greater than K in a window of size equal to the count.

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Prodevelopertutorial

406

Arrays: Find a triplet that sum to a given value

The problem is to find a triplet in an unsorted array that sums up to a given value.
Two approaches to solve this problem are using three loops/brute force approach and an optimized approach using hashing.
In the brute force approach, three nested for loops are used to check for triplets that sum up to the given value.
In the optimized approach, a set is used to check if the remaining part of the triplet exists in the set.

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Dev

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A case study of creating configurable values

A case study of creating configurable values
The new requirement: Divide product codes into batches
Proposed Solution 1: Configurable solution with value passed from Admin UI
Proposed Solution 2: Environment variable solution to directly obtain the value

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Medium

261

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XRP value could increase by 60% as Gary Gensler exits SEC

XRP value could increase by 60% as Gary Gensler exits SEC.
Ripple's recent court win in the ongoing SEC case has given XRP a boost.
Speculation arises regarding a potential rally for XRP with Gensler's departure and Ripple's victory.
Technical charts and market trends hint at a possible 60% gain for XRP in the future.

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Prodevelopertutorial

Arrays: Find whether an array is subset of another array

To check if arr2 is a subset of arr1, there are multiple approaches.
One approach is to use two loops, where for each element of arr2, check if it exists in arr1.
Another approach is to sort arr1 and use binary search to search each element of arr2 in arr1.

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Medium

297

The Flaw in Square Inheriting from Rectangle

The Liskov Substitution Principle states that objects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program.
In the case of the `Square` class inheriting from the `Rectangle` class, there are problems with violating the principle.
The issue arises when the width and height of a square can be set independently, breaking the invariant that a square must always have equal sides.
To address this, a redesign of the hierarchy is proposed, introducing a `Shape` base class and implementing specific behavior in each shape class.

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Dev

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The basic components of a unit test in Angular

Unit testing in Angular is worth it and simpler than it might seem.
Unit tests verify that code works correctly by testing small components in isolation.
Unit testing saves time and money by identifying bugs during development.
The file that contains unit tests in Angular is called a spec file, which is generated alongside each Angular component.
Jasmine is a JavaScript testing framework used to write Aungular unit tests.
The it global function is used to define specs (tests) and describe function is used to group related specs (suites).
The expect function compares actual and expected values with the help of matcher functions.
Setup and Teardown functions prepare and clean up the environment for test execution, helping to ensure that specs are isolated and free from interference from leftover state from other specs.
Jasmine provides functions to help developers with setup and teardown: beforeEach, afterEach, beforeAll, and after All.
Unit testing improves code quality by encouraging readable, maintainable, and reusable code, and gives developers confidence that new code additions are not breaking existing code.

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Dev

185

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Preserving Scroll State on Tab Change in Angular

Preserving scroll state on tab change is crucial for enhancing user experience in a multi-tabbed Angular application.
By using window.scrollY to save and retrieve scroll positions, users can pick up where they left off when navigating between tabs.
The solution involves saving the current scroll position before switching tabs and restoring it when the user returns to the tab.
Optional enhancements like debouncing and horizontal scroll preservation can be implemented for more refined scroll management.

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Dev

406

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Understanding Tuple Unpacking and Iteration in Python: A Beginner's Guide

Tuple unpacking in Python allows you to assign multiple variables from a tuple in a single line.
Tuple unpacking is commonly used for swapping values without a temporary variable.
Tuples are immutable in Python, meaning their contents cannot be changed once created.
Iterating over tuples allows you to access and process each element one at a time.

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