The Constructor Injection design pattern is a pattern that helps you declare all the required dependencies of a class in it's constructor. This is useful because it helps you decouple the code, you can specify an interface instead of a concrete type, remember, program to an interface. Also, in the constructor it is easier to … Continue reading Constructor Injection and Null Object Design Patterns
Programming
Composition Root Pattern: How to Write Modular Software
The composition root is a design pattern which helps you structure a software application by implementing a class that builds all the other classes. In this example we will examine this pattern in Python. Here's the object graph of the classes that we're going to implement: I have designed a sample application that we're going … Continue reading Composition Root Pattern: How to Write Modular Software
LeetCode: Arrays 101: Inserting Items Into an Array
Hello, Here are my solutions for the second part of the card: Arrays 101, from LeetCode. Duplicate Zeroes Given an array of integers, remove duplicate zeroes and shift the remaining elements. https://leetcode.com/problems/duplicate-zeros/ class Solution: def duplicateZeros(self, arr: List[int]) -> None: """ Do not return anything, modify arr in-place instead. """ index = 0 arr_length = … Continue reading LeetCode: Arrays 101: Inserting Items Into an Array
LeetCode: Add Two Numbers Python 3 iterative solution
[Problem Link] Hello, Here's my solution for the add two numbers problem on LeetCode. Example: Input: (2 -> 4 -> 3) + (5 -> 6 -> 4) Output: 7 -> 0 -> 8 Explanation: 342 + 465 = 807. When doing problems on websites such as LeetCode, I like to code in my own IDE, … Continue reading LeetCode: Add Two Numbers Python 3 iterative solution
