Help Please!

ruby-talk
1

I'm new to Ruby, and have basically NO previous coding experience in any
other language.

What I'm trying to do is create a program that will run from cmd prompt, and
let people type in words, or paragraphs etc., and then have those words etc.
reversed.

Example:

This is my sentence => sentence my is This

Any help with this would be greatly appreciated!

2

I'm new to Ruby, and have basically NO previous coding experience in any
other language.

What I'm trying to do is create a program that will run from cmd prompt, and
let people type in words, or paragraphs etc., and then have those words etc.
reversed.

Example:

This is my sentence => sentence my is This

Any help with this would be greatly appreciated!

Do you have `ri` installed on your system?

ri is a program which can provide help with Ruby's core classes and methods.

Try (from your command prompt, not from IRB)

ri String#split

ri Array#reverse

ri Array#join

Hope this helps,

Bill

···

From: "1up gfx" <jordan.rubytalk@gmail.com>

3

~> ruby -e 'ARGF.each { |l| puts l.split.reverse.join( " " ) }'
this is my sentence
sentence my is this

Its a great answer to your assignment if you can explain what all is happening. Good Luck!

Wes

···

On Jan 2, 2008, at 11:28 PM, 1up gfx wrote:

I'm new to Ruby, and have basically NO previous coding experience in any
other language.

What I'm trying to do is create a program that will run from cmd prompt, and
let people type in words, or paragraphs etc., and then have those words etc.
reversed.

Example:

This is my sentence => sentence my is This

Any help with this would be greatly appreciated!

4

What I'm trying to do is create a program that will run from cmd prompt, and
let people type in words, or paragraphs etc., and then have those words etc.
reversed.

I can't remember where exactly, but this is covered in at least one of
the basic tutorials (I know because I ran through them!). Do a google
search for "Ruby tutorial" and check some of those out.

If you can't find it after searching let me know and I'll try to track
it down.

5

I'm new to Ruby, and have basically NO previous coding experience in any
other language.

What I'm trying to do is create a program that will run from cmd prompt, and
let people type in words, or paragraphs etc., and then have those words etc.
reversed.

Example:

This is my sentence => sentence my is This

Any help with this would be greatly appreciated!

First attempt:

<macbook of doom:giles> [01-03 06:50] ~
! irb

gets.reverse

This is my sentence
=> "\necnetnes ym si sihT"

Second attempt:

<macbook of doom:giles> [01-03 06:51] ~
! irb

got = gets

This is my sentence
=> "This is my sentence\n"

got.chomp! # remove the newline

=> "This is my sentence"

gots = got.split # turn it into an array

=> ["This", "is", "my", "sentence"]

gots.reverse.join(" ") + "." # reverse the array, join it with

spaces, add a dot
=> "sentence my is This."

voila!

···

On 1/2/08, 1up gfx <jordan.rubytalk@gmail.com> wrote:

--
Giles Bowkett

Podcast: http://hollywoodgrit.blogspot.com
Blog: http://gilesbowkett.blogspot.com
Portfolio: http://www.gilesgoatboy.org
Tumblelog: http://giles.tumblr.com

6

W

···

On Jan 3, 2008 12:48 AM, Wes Bailey <wes@verticalresponse.com> wrote:

On Jan 2, 2008, at 11:28 PM, 1up gfx wrote:

> I'm new to Ruby, and have basically NO previous coding experience in
> any
> other language.
>
> What I'm trying to do is create a program that will run from cmd
> prompt, and
> let people type in words, or paragraphs etc., and then have those
> words etc.
> reversed.
>
> Example:
>
> This is my sentence => sentence my is This
>
> Any help with this would be greatly appreciated!

~> ruby -e 'ARGF.each { |l| puts l.split.reverse.join( " " ) }'
this is my sentence
sentence my is this

Its a great answer to your assignment if you can explain what all is
happening. Good Luck!

Wes

Well, It's not really an assignment. I'm getting my cousin (who is a Java
programmer) to help me out with programming. He's basically just giving me
little tasks to do so that I become more familiar with programming. But,
since I don't really have any previous experience, I don't really know what
to do half of the time. Thanks for your replies though.

7

Also:

  ri Kernel#gets

  ri Kernel#puts

. . . and, aside from basic Ruby syntax, that might be everything you
need for the program.

···

On Thu, Jan 03, 2008 at 04:38:25PM +0900, Bill Kelly wrote:

From: "1up gfx" <jordan.rubytalk@gmail.com>
>
>I'm new to Ruby, and have basically NO previous coding experience in any
>other language.
>
>What I'm trying to do is create a program that will run from cmd prompt,
>and
>let people type in words, or paragraphs etc., and then have those words
>etc.
>reversed.
>
>Example:
>
>This is my sentence => sentence my is This
>
>Any help with this would be greatly appreciated!

Do you have `ri` installed on your system?

ri is a program which can provide help with Ruby's core
classes and methods.

Try (from your command prompt, not from IRB)

ri String#split

ri Array#reverse

ri Array#join

--
CCD CopyWrite Chad Perrin [ http://ccd.apotheon.org ]
Rudy Giuliani: "You have free speech so I can be heard."

8

Wes Bailey wrote:

~> ruby -e 'ARGF.each { |l| puts l.split.reverse.join( " " ) }'
this is my sentence
sentence my is this

Golfing away...

$ ruby -ane 'puts $F.reverse.join(" ")'
1 2 3
3 2 1

···

--
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

9

Oh that's clever! I do believe you have honors on the next tee. :wink:

Wes

···

Golfing away...

$ ruby -ane 'puts $F.reverse.join(" ")'
1 2 3
3 2 1

--
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

10

irb(main):001:0> puts $F.reverse.join(" ")
NoMethodError: undefined method `reverse' for nil:NilClass
    from (irb):1
irb(main):002:0>

···

On Jan 3, 2008 10:53 AM, Joel VanderWerf <vjoel@path.berkeley.edu> wrote:

Wes Bailey wrote:
> ~> ruby -e 'ARGF.each { |l| puts l.split.reverse.join( " " ) }'
> this is my sentence
> sentence my is this

Golfing away...

$ ruby -ane 'puts $F.reverse.join(" ")'
1 2 3
3 2 1

--
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

It doesn't like your code... I keep on getting errors:

11

You don't use irb for that. At the command prompt, that's the ruby command you give it.
$F = is an environmental variable that can receive split line input as an array

a = autosplit mode, basically takes the input and splits it out
n = pauses the command, like assuming a "while" command
e = the command

regards,
ch0wda

···

On Jan 3, 2008, at 2:46 PM, 1up gfx wrote:

On Jan 3, 2008 10:53 AM, Joel VanderWerf <vjoel@path.berkeley.edu> > wrote:

Wes Bailey wrote:

~> ruby -e 'ARGF.each { |l| puts l.split.reverse.join( " " ) }'
this is my sentence
sentence my is this

Golfing away...

$ ruby -ane 'puts $F.reverse.join(" ")'
1 2 3
3 2 1

--
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

It doesn't like your code... I keep on getting errors:

irb(main):001:0> puts $F.reverse.join(" ")
NoMethodError: undefined method `reverse' for nil:NilClass
    from (irb):1
irb(main):002:0>

12

guys!

···

On Jan 3, 2008 12:58 PM, Joshua Schairbaum <joshua.schairbaum@gmail.com> wrote:

You don't use irb for that. At the command prompt, that's the ruby
command you give it.
$F = is an environmental variable that can receive split line input
as an array

a = autosplit mode, basically takes the input and splits it out
n = pauses the command, like assuming a "while" command
e = the command

regards,
ch0wda
On Jan 3, 2008, at 2:46 PM, 1up gfx wrote:

> On Jan 3, 2008 10:53 AM, Joel VanderWerf <vjoel@path.berkeley.edu> > > wrote:
>
>> Wes Bailey wrote:
>>> ~> ruby -e 'ARGF.each { |l| puts l.split.reverse.join( " " ) }'
>>> this is my sentence
>>> sentence my is this
>>
>> Golfing away...
>>
>> $ ruby -ane 'puts $F.reverse.join(" ")'
>> 1 2 3
>> 3 2 1
>>
>> --
>> vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407
>>
>> It doesn't like your code... I keep on getting errors:
>
> irb(main):001:0> puts $F.reverse.join(" ")
> NoMethodError: undefined method `reverse' for nil:NilClass
> from (irb):1
> irb(main):002:0>

Alright, never mind, I got the program to work. Thank you for your help