Displaying Only the First X Words of a String in Rails

Only show first letters of string of each word

"Rock Paper Shotgun".split.map(&:first).join.upcase

edit:

irb:
[4] pry(main)> "rock Paper Shotgun".split.map(&:first).join.upcase

=> "RPS"

Truncate string to the first n words

n = 3
str = "your long    long   input string or whatever"
str.split[0...n].join(' ')
 => "your long long"

str.split[0...n] # note that there are three dots, which excludes n
 => ["your", "long", "long"]

HTML title attribute in Rails displaying only first word

I think you need to add quoting to the HTML in the view. If you view source on the generated HTML, I'm willing to bet it looks like this:

<div title=This is a super cool item! >

The browser will interpret that as the div having a title with the value This, and then attributes named is, a, super, cool, and item!.

If you change your view to this:

<div title="<%= item.description %>" >

Then your generated HTML should look like this:

<div title="This is a super cool item!" >

How to display the first 10 characters only of a message stored in database?

Try this:

truncate(message.body, :length => 10)

Ruby: How to get the first character of a string

You can use Ruby's open classes to make your code much more readable. For instance, this:

class String
  def initial
    self[0,1]
  end
end

will allow you to use the initial method on any string. So if you have the following variables:

last_name = "Smith"
first_name = "John"

Then you can get the initials very cleanly and readably:

puts first_name.initial   # prints J
puts last_name.initial    # prints S

The other method mentioned here doesn't work on Ruby 1.8 (not that you should be using 1.8 anymore anyway!--but when this answer was posted it was still quite common):

puts 'Smith'[0]           # prints 83

Of course, if you're not doing it on a regular basis, then defining the method might be overkill, and you could just do it directly:

puts last_name[0,1] 

Get first N characters from string without cutting the whole words

s = "Coca-Cola is the most popular and biggest-selling soft drink in history, as well as the best-known brand in the world."
s = s.split(" ").each_with_object("") {|x,ob| break ob unless (ob.length + " ".length + x.length <= 70);ob << (" " + x)}.strip
#=> "Coca-Cola is the most popular and biggest-selling soft drink in"

Get substring after the first = symbol in Ruby

Not exactly .after, but quite close to:

string.partition('=').last

http://www.ruby-doc.org/core-1.9.3/String.html#method-i-partition

Show only some words from post as preview

Know the builtin tools.

Ruby - How to select some characters from string

Try foo[0...100], any range will do. Ranges can also go negative. It is well explained in the documentation of Ruby.

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