Iterate Array and (pretty)print

ruby-talk
1

Hi,

I am trying to iterate through an array, convert the output to a string
and puts that string.

CODE:

@hosts = ["test1", "test2", "test3", "test4"
puts @hosts.each { |x| print x + "\n" }.to_s

CURRENT OUTPUT:

["test1", "test2", "test3", "test4"]

DESIRED OUTPUT:

However, I want this output to go into an email message, so I'm want to
lose the Square brackets and quotes, so it looks like this (and is a
string):

test1
test2
test3

Any ideas?

Thanks.

Dwight

···

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Posted via http://www.ruby-forum.com/.

2

I am trying to iterate through an array, convert the output to a string
and puts that string.

CODE:

@hosts = ["test1", "test2", "test3", "test4"
puts @hosts.each { |x| print x + "\n" }.to_s

CURRENT OUTPUT:

["test1", "test2", "test3", "test4"]

DESIRED OUTPUT:

However, I want this output to go into an email message, so I'm want to
lose the Square brackets and quotes, so it looks like this (and is a
string):

test1
test2
test3

Any ideas?

Hi there,

In this case I think a simple join would be appropriate:

irb(main):001:0> @hosts = ["test1", "test2", "test3", "test4"]
=> ["test1", "test2", "test3", "test4"]
irb(main):002:0> puts @hosts.join("\n")
test1
test2
test3
test4

Regards,
Chris White
http://www.twitter.com/cwgem

3

hi,

u have output @hosts' elements in the block? why would you add a puts in
front of it?

u can do it just with Array.join

*puts hosts.join("\n")*

···

On Tue, Sep 13, 2011 at 10:33 PM, dwight schrute <spambocks@yahoo.ca> wrote:

Hi,

I am trying to iterate through an array, convert the output to a string
and puts that string.

CODE:

@hosts = ["test1", "test2", "test3", "test4"
puts @hosts.each { |x| print x + "\n" }.to_s

CURRENT OUTPUT:

["test1", "test2", "test3", "test4"]

DESIRED OUTPUT:

However, I want this output to go into an email message, so I'm want to
lose the Square brackets and quotes, so it looks like this (and is a
string):

test1
test2
test3

Any ideas?

Thanks.

Dwight

--
Posted via http://www.ruby-forum.com/\.

--
Best Regards,

Larry Lv
@ Baidu NLP

4

Except, I need to put the output into a string. When I use the to_s
method, I end up with square brackets and quotes:

irb(main):001:0> @hosts = ["test1", "test2", "test3", "test4"]
=> ["test1", "test2", "test3", "test4"]
irb(main):002:0> puts @hosts
test1
test2
test3
test4
=> nil
irb(main):003:0> puts @hosts.to_s
["test1", "test2", "test3", "test4"]
=> nil

···

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5

Thank you Harry! That is exactly what I needed :slight_smile:

Dwight

···

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6

Just for completeness since nobody has quite covered it yet,
@hosts.each { ... } returns the receiver, which in this case is
@hosts, and then you call .to_s on the result. So, closer to the
argument actually passed to puts, you essentially have @hosts.to_s
which is "[\"test1\", \"test2\", \"test3\", \"test4\"]", which, when
puts'd, is ["test1", "test2", "test3", "test4"]. However, in your
block you also print, so the real, full output should have been:

test1
test2
test3
test4
["test1", "test2", "test3", "test4"]

···

On Tue, Sep 13, 2011 at 3:33 PM, dwight schrute <spambocks@yahoo.ca> wrote:

puts @hosts.each { |x| print x + "\n" }.to_s

7

You don't even need the join.

irb(main):001:0> @hosts = ["test1", "test2", "test3", "test4"]
=> ["test1", "test2", "test3", "test4"]
irb(main):002:0> puts @hosts
test1
test2
test3
test4
=> nil
irb(main):003:0>

Cheers

robert

···

On Tue, Sep 13, 2011 at 4:40 PM, Larry Lv <larrylv1990@gmail.com> wrote:

hi,

u have output @hosts' elements in the block? why would you add a puts in
front of it?

u can do it just with Array.join

*puts hosts.join("\n")*

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

8

You don't even need the join.

irb(main):001:0> @hosts = ["test1", "test2", "test3", "test4"]
=> ["test1", "test2", "test3", "test4"]
irb(main):002:0> puts @hosts
test1
test2
test3
test4
=> nil
irb(main):003:0>

Cheers

robert

But, he wants it to be a string.

print @hosts.map{|x| x + "\n"}.join

Harry

9

> hi,
>
> u have output @hosts' elements in the block? why would you add a puts in
> front of it?
>
> u can do it just with Array.join
>
> *puts hosts.join("\n")m*

You don't even need the join.

irb(main):001:0> @hosts = ["test1", "test2", "test3", "test4"]
=> ["test1", "test2", "test3", "test4"]
irb(main):002:0> puts @hosts
test1
test2
test3
test4
=> nil
irb(main):003:0>

I think this is just an artefact of "puts" and not relevant for the initial
problem.

If the original posters wants to have it in an e-mail, he will probably will
want to interpolate in a template. Using simply the @hosts as is suggested
above will then yield this:

$ ruby <<EOF
@hosts = ["test1", "test2", "test3", "test4"]
puts "#{@hosts}"

EOF

test1test2test3test4

I think the OP probably needed to use 'map' instead of 'each'.

pev@pev-desktop:~/a$ ruby <<EOF
@hosts = ["test1", "test2", "test3", "test4"]
hosts_string = @hosts.join("\n")

puts hosts_string
EOF

test1
test2
test3
test4

HTH,

Peter

···

On Tue, Sep 13, 2011 at 4:51 PM, Robert Klemme <shortcutter@googlemail.com>wrote:

On Tue, Sep 13, 2011 at 4:40 PM, Larry Lv <larrylv1990@gmail.com> wrote:

Cheers

robert

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

--
Peter Vandenabeele
gsm: +32-478-27.40.69
e-mail: peter@vandenabeele.com
http://twitter.com/peter_v