Ruby TYS

[wtd]

Cervantes wrote:

wtd wrote:

Does Ruby have a case ("switch" in some languages) statement?

No. Trick question: Ruby has a case expression.

Indeed.

[Cervantes]

There's quite a few Ruby TYS questions over at Freerange right now. I'll copy the questions only to here.

Cervantes wrote:

Let's start off with a fairly easy one.

code:

irb(main):001:0> true | puts("or") or => true

Explain why "or" is output, despite the fact that the '|' operator should know the whole expression is true after seeing the initial 'true', since true or something is true.

Cervantes wrote:

This next TYS is tough, I think, but it's worth it. It's quite fun.

In one line of code, write a program that computes the factorial of a given number. I say it in this manner because I'm not asking you to write a function. Indeed, there is to be no use of "def" or "while" or "loop" any other looping structure.

I'm being kind of vague about this because otherwise I'll give too much away. Feel free to post answers; if it's not what I'm looking for, I'll let you know.

Addendum: I want a recursive solution. But keep in mind, you can't define any methods!

Cervantes wrote:

In one line (no semi-colon cheating, of course), write a program that loops infinitely. It should not crash due to a stack overflow (ie. we're not using recursion, here). You may not use any keywords.

For discussion and answers, please visit the Freerange Ruby TYS thread.

[zylum]

Ruby:

puts (1..ARV[0].to_i).inject{|p,n|p*n}

[Cervantes]

zylum wrote:

Ruby:

puts (1..ARV[0].to_i).inject{|p,n|p*n}

Since when has zylum been doing Ruby?

That's essentially the solution wtd posted on the Freerange forums, which prompted me to add that addendum: I want a recursive solution.

In any case, the answers to all these are found in the Freerange TYS thread.

Here's two more:

Cervantes wrote:

Quit a standard IRB session. You cannot use any irb methods such as (exit, quit, irb_exit, irb_quit...). Things like Ctrl+D and Ctrl+Z do not count. IRB should not exit because of any error. The code you write into IRB that makes it exit must be valid Ruby code.

Cervantes wrote:

Write a short amount of code that makes the following possible:

code:

p Rubidium.new

output wrote:

#<Rubidium:0xb7cf9ed0>

(Of course, the 0xb7cf9ed0 will change.)
The code should apply generally; that is, we're not writing an empty Rubidium class, here.

[zylum]

Cervantes wrote:

Since when has zylum been doing Ruby?

since two days ago

[wtd]

zylum wrote:

Cervantes wrote:

Since when has zylum been doing Ruby?

since two days ago

<Mr. Burns> Excellent... </Mr. Burns>