Change a string with offset : char in string « String « Ruby

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Ruby » String » char in string

Change a string with offset





s = "hello"

s[0,2]          # "he"

s[-1,1]         # "o": returns a string, not the character code ?o

s[0,0]          # "": a zero-length substring is always empty

s[0,10]         # "hello": returns all the characters that are available

s[s.length,1]   # "": there is an empty string immediately beyond the end

s[s.length+1,1] # nil: it is an error to read past that

s[0,-1]         # nil: negative lengths don't make any sense

Related examples in the same category

1.	Character literal
2.	Map chars in a string
3.	specify a Fixnum (integer) as an index, it returns the decimal character code for the character found at the index location
4.	Use string as array
5.	taking the first letter from a string
6.	Accessing Strings
7.	If you add the chr method from the Integer class, you'll get the actual character:
8.	use an offset and length (two Fixnums) to tell [] the index location where you want to start, and then how many characters you want to retrieve
9.	Enter a range to grab a range of characters.
10.	use regular expressions
11.	Adding another argument, a Fixnum, returns that portion of the matched data, starting at 0 in this instance
12.	Concatenate string by string index
13.	Loop through a string with while

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