Core Extensions String Access

String#at

Returns a substring of a string object. Same interface as String#[].

str = "hello"str.at(0)      # => "h"str.at(1..3)   # => "ell"str.at(-2)     # => "l"str.at(-2..-1) # => "lo"str.at(5)      # => nilstr.at(5..-1)  # => ""

String#from

Returns a substring from the given position to the end of the string.

str = "hello"str.from(0)  # => "hello"str.from(3)  # => "lo"str.from(-2) # => "lo"

String#to

Returns a substring from the beginning of the string to the given position.

If the position is negative, it is counted from the end of the string.

str = "hello"str.to(0)  # => "h"str.to(3)  # => "hell"str.to(-2) # => "hell"

from and to can be used in tandem.

str = "hello"str.from(0).to(-1) # => "hello"str.from(1).to(-2) # => "ell"

String#first

Returns the first character, or a given number of characters up to the length of the string.

str = "hello"str.first    # => "h"str.first(1) # => "h"str.first(2) # => "he"str.first(0) # => ""str.first(6) # => "hello"

String#last

Returns the last character, or a given number of characters from the end of the string counting backwards.

str = "hello"str.last    # => "o"str.last(1) # => "o"str.last(2) # => "lo"str.last(0) # => ""str.last(6) # => "hello"

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