To check if a TypeScript array contains a specific value, call includes(): cities.includes(“Denver”) returns true or false. That works for strings, numbers and booleans. For an array of objects it will not, because includes() compares by reference, so you test a property with some() instead: orders.some(o => o.id === “ORD-1001”). This guide covers both, plus … Read more >>
To find the maximum value in an array of objects in TypeScript, decide first what you want back. For just the number, map the property and use Math.max(): Math.max(…employees.map(e => e.salary)). For the whole object that holds it, use reduce() and keep whichever item is larger. Both are one line, and both have an edge … Read more >>
When I build small file-processing tools or work with API payloads, I often need to change binary data before saving or sending it. A regular Python string will not help because strings store text and do not allow changes in place. Even bytes objects stay fixed after creation. That is where the Python bytearray() function … Read more >>
A small reporting script can look perfect until it produces the wrong totals for Chicago, Austin, and Seattle. Printing every variable may help, but it quickly makes the terminal noisy and hard to follow. That is where the Python breakpoint() function saves time. I use it when I need to stop a script at the … Read more >>
When I build small reporting scripts, one common job is deciding whether the script should continue. Does the CSV contain rows? Did the API return data? Did a user enter a value? The Python bool() function gives a clean, reliable answer: True or False. You will use bool() constantly in if statements, loops, input checks, … Read more >>
The Python ceil() function rounds a number up to the nearest whole number. It lives in the math module, so you call it as math.ceil(x) after import math: math.ceil(2.1) gives 3, and math.ceil(-2.8) gives -2, because up means towards positive infinity. It always returns an int, never a float. This guide covers the ceiling function … Read more >>
As a Python developer, I often work with screenshots, product images, blog images, and photographs that need to be uploaded to websites or shared online. Large image files can slow down websites, consume storage, and make file sharing inconvenient. To solve this problem, I built an Image Compressor using Python and Streamlit. This tool allows … Read more >>
When I work with scanned documents, screenshots, receipts, or batches of photos, converting each image manually into a PDF quickly becomes repetitive. A small Python desktop application solves that problem nicely. For this project, I wanted more than a simple image-to-PDF script. The application needs a graphical user interface, multiple image selection, image ordering, validation, … Read more >>
A common problem in a React dashboard happens when a user opens a customer details page, starts loading data, and quickly navigates away. The API request finishes afterward, and the old component still tries to update its state. I have seen this issue often in real-world React applications with API calls, timers, subscriptions, and delayed … Read more >>
A React date picker component gives users a calendar to choose a date from instead of a free-text field. You have two realistic options: the browser’s own <input type=”date”>, which costs nothing and looks different in every browser, or the react-datepicker library, which is the one most projects mean when they say “React date picker”. … Read more >>
Free PDF · 112 pages
Tell me where to send it and the free 112-page PDF is on its way.
Your free 51 Python Programs PDF is on its way to . Can't find it in a few minutes? Look in your Promotions or Spam folder.