Ruby Update Part 1.
I’m walking myself through the Ruby Course, by Brian Schroder, and using SciTE as my temporary IDE. Here are a few things that made me scratch me head.
Single and double quotation marks matter a lot:
Stacks and queues can be implemented two ways to get the same behavior, but the container (array) is way different.
| Stack as I know it:
stack = Array.new()
stack.push(‘a1′) stack.push(‘a2′) stack.push(‘a3′) puts stack.pop until stack.empty? |
Queue as I know it:
queue = Array.new()
queue.push(‘q1′) queue.push(‘q2′) queue.push(‘q3′) puts queue.shift until queue.empty? |
| No-no stack:
stack = Array.new()
stack.unshift(‘s1′) stack.unshift(‘s2′) stack.unshift(‘s3′) puts stack.shift until stack.empty? |
No-no queue:
queue = Array.new()
queue.unshift(‘q1′) queue.unshift(‘q2′) queue.unshift(‘q3′) puts queue.pop until queue.empty? |
I also came across some funky data type, the DEQUE/DEQUEUE” – a double-ended queue. I’m not sure how to use this in real life, can anyone give me a good example? I’m still trying to get me head wrapped around this data structure…
| Deque 1:
deque = Array.new()
deque.unshift(‘unshift1′) deque.unshift(‘unshift2′) deque.unshift(‘unshift3′) deque.push(‘push1′) deque.push(‘push2′) deque.push(‘push3′) puts deque.shift until deque.empty? |
Deque 2:
deque = Array.new()
deque.unshift(‘unshift1′) deque.unshift(‘unshift2′) deque.unshift(‘unshift3′) deque.push(‘push1′) deque.push(‘push2′) deque.push(‘push3′) puts deque.pop until deque.empty? |
Right now, I’m trying to get a good understanding of the hashes, iterators and blocks. It’s not new to me, but the syntax hurts. After a few exercises, hopefully I’ll get it.
Oh yeah, and Happy Valentine’s Day.
puts “#{multi_foo(2)}“ #outputs results of function ‘multi_foo(2)’