May 2018
Beginner to intermediate
290 pages
6h 43m
English
Content preview from Getting Clojure
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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.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.
Asking Questions
Being able to branch on an explicit true or false is only half of what makes if the programming workhorse that it is. The other half is being able to ask the questions that evaluate to a Boolean. Probably the most common question we ask in programs is Does this thing equal this other thing? Happily, the Clojure equality-testing function has a very obvious name.
It’s just a single equals sign:
| | (= 1 1) ; True! |
| | |
| | (= 2 (+ 1 1)) ; True again! |
| | |
| | (= "Anna Karenina" "Jane Eyre") ; Nope. |
| | |
| | (= "Emma" "Emma") ; Yes! |
Like + and *, the = function looks like an operator but is really just a function. And like + and *, the = function will take any number of arguments:
| | (= (+ 2 2) 4 (/ 40 10) (* 2 2) (- 5 1)) ; True! |
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