December 2017
Intermediate to advanced
648 pages
13h 46m
English
Content preview from iOS 11 Swift Programming Cookbook
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.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.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.
Chapter 4. Measurements and Units
We’ve all been there! You need to convert one unit to another, and you begin your journey, most of the time, by Googling what the conversion should be. You can now use some built-in structures to represent and convert your units.
The following classes and structures appear throughout this chapter:
Unit- The base class for all the units that are in the SDK itself. This class defines a symbol for the unit, such as
mfor meters. Dimension- The class that inherits from
Unitand defines the converter to be used between various units. UnitLength,UnitMass, and the like- Basic units that inherit from
Dimension. Each unit offers alternative ways of representing a particular measure, such as length or mass. Each unit also standardizes the various symbols for its measure, such asmfor meters,kmfor kilometers, andsmifor Scandinavian miles (with each Scandinavian mile being equal to 10 kilometers). - Measurement
- The base structure for defining a value with a unit. Every measurement has a value of type
Doubleand a unit of typeUnit.
4.1 Converting Between and Working with Length Units
Problem
You want to be able to represent values with the unit of length, such as kilometers and miles, and would like to be able to perform some basic tasks on them, such as converting one unit to another, or adding and subtracting values represented in different units.
Solution
Follow these steps:
- Represent your values first by constructing instances of
Measurement ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.