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| May 28, 2023 | » | Relational Model Versus Document Model
8 min; updated May 29, 2023
A relational data model uses tables that consist of rows and columns. A row can be uniquely identified by a table + ID combination. A column entry can reference another row in another table through a shared key. One goal is to avoid duplicating data. However, to answer a real-world query, we end up paying th cost by joining results from multiple tables. That said, with proper indexing and prior research, combining results is pretty fast.... |
| Sep 28, 2021 | » | Observer
8 min; updated Feb 12, 2023
notes that , the primary source, glosses over nitty-gritties. e.g. the “message queue” server. Maybe reading through these will provide a larger perspective to design decisions made in Chromium regarding observers. Rant: some of willchan’s thoughts on WeakPtr, for those who care to read criticizes the observer pattern for murking dependency chains. Investigate more in this regard. Intent A one-to-many dependency between object so that when one object (subject) changes, all its dependents (observers) are notified and update automatically.... |
| May 12, 2022 | » | Classes in C++
15 min; updated May 12, 2022
quotes Doug McIlroy: Those types are not “abstract”; they are as real as int and float. What is the context of this quote? A class is a user-defined type provided to represent a concept in the code of a program. Essentially, all language facilities beyond the fundamental types, operators, and statements exist to help define better class or to use them more conveniently.... |
| Mar 16, 2022 | » | AoC 2021 Day 09: Smoke Basin
13 min; updated Mar 16, 2022
Multi-dimensional arrays using |
| Feb 23, 2022 | » | AoC 2021 Day 03: Binary Diagnostic
14 min; updated Feb 23, 2022
Day 3 - Advent of Code 2021. adventofcode.com . Accessed Feb 23, 2022. Problem Description Part One The submarine has been making some odd creaking noises, so you ask it to produce a diagnostic report just in case. The diagnostic report (your puzzle input) consists of a list of binary numbers which, when decoded properly, can tell you many useful things about the conditions of the submarine.... |
| Jan 15, 2022 | » | 020. Factorial Digit Sum
4 min; updated Jan 15, 2022
Problem Statement \(n!\) means \(n \times (n - 1) \times … \times 3 \times 2 \times 1\). For example, \(10! = 10 \times 9 \times … \times 3 \times 2 \times 1 = 3628800\), and the sum of the digits in the number \(10!\) is \(3 + 6 + 2 + 8 + 8 + 0 + 0 = 27\). Find the sum of the digits in the number \(100!... |