August 2022
Beginner
912 pages
19h 57m
English
Content preview from Coding All-in-One For Dummies, 2nd Edition
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Chapter 3
Working with Variables
IN THIS CHAPTER
Creating and using variables
Understanding variable scope
Knowing JavaScript’s data types
Naming variables
Using built-in functions to work with variables
“Beauty is variable, ugliness is constant.”
— DOUGLAS HORTON (1891 – 1968)
In this chapter, you discover how to create variables, fill them with values, use functions to find out what type of data is in your variables, convert between different data types, and manipulate the data in your variables.
Understanding Variables
Variables are representative names in a program. Just as x may stand for some as-yet-unknown value in algebra, or x may mark the spot where the treasure is buried on a pirate’s map, variables are used in programming to represent something else.
You can think about variables as containers that contain data. You can give these containers names, and later you can recall and change the data in a variable by using its name.
Without variables, every computer program ...
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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.