Truncate string with Rails?

Question

I want to truncate a string as follows:

input:

string = \"abcd asfsa sadfsaf safsdaf aaaaaaaaaa aaaaaaaaaa ffffdffffdffffdffffddd\"

Answer 1

In the simplest case:

string = "abcd asfsa sadfsaf safsdaf aaaaaaaaaa aaaaaaaaaa ffffdffffdffffdffffffffd"
tr_string = string[0, 20] + "..." + string[-5,5]

or

def trancate(string, length = 20)
  string.size > length+5 ? [string[0,length],string[-5,5]].join("...") : string
end

# Usage
trancate "abcd asfsa sadfsaf safsdaf aaaaaaaaaa aaaaaaaaaa ffffdffffdffffdffffffffd"
#=> "abcd asfsa sadfsaf s...ffffffffd"
trancate "Hello Beautiful World"
#=> "Hello Beautiful World"
trancate "Hello Beautiful World", 5
#=> "Hello...World"