October 2021
Intermediate to advanced
500 pages
16h 23m
English
Content preview from Kotlin Programming: The Big Nerd Ranch Guide, 2nd Edition
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Regular Expressions
In general, it is a good idea to check inputs before performing “dangerous” operations that could cause your program to crash. There are several approaches you can take to prevent your application from crashing when it receives invalid input. There are also ways to handle errors after they happen, which you will see in Chapter 7.
For now, you will prevent this crash by making sure the user has entered a number before attempting to call toInt on it. Specifically, you will ensure that the string returned by readLine only contains digits. Kotlin has many tools in place that can help you check that a user’s input is valid. One technique makes use of a regular expression – a commonly used tool for parsing and working ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.