Getting a substring in Ruby by x number of chars

How about this?

s[0, s.length - 3]

Or this

s[0..-4]

edit

s = "abcdefghi"
puts s[0, s.length - 3]  # => abcdef
puts s[0..-4]            # => abcdef

Use something like this:

s = "abcdef"
new_s = s[0..-2] # new_s = "abcde"

See the slice method here: http://ruby-doc.org/core/classes/String.html

Another option could be to use the slice method

a_string = "a1wer4zx"
a_string.slice(0..5) 
=> "a1wer4"

Documentation: http://ruby-doc.org/core-2.5.0/String.html#method-i-slice

Another option is getting the list of chars of the string, takeing x chars and joining back to a string:

[13] pry(main)> 'abcdef'.chars.take(2).join
=> "ab"
[14] pry(main)> 'abcdef'.chars.take(20).join
=> "abcdef"

if you need it in rails you can use first (source code)

s = '1234567890'
x = 4
s.first(s.length - x) # => "123456"

there is also last (source code)

s.last(2) # => "90"

alternatively check from/to

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