Ruby: String Operations

Substring

Substring extraction is done by appending a bracket [index,count].

#-*- coding: utf-8 -*-
# ruby

# substring
aa = "01234567"
p aa[0,2]                   # prints “01”. Start with index, then count of chars.

# negative index counts from end. -1 is last char.
p aa[-2,2]                   # prints “67”.

String Length

Length of the string is .length method.

# -*- coding: utf-8 -*-
# ruby

a="this"
p a.length                      # 4

String Join and Repetition

Strings can be joined by a plus sign +.

# -*- coding: utf-8 -*-
# ruby

p "this" + " that"              # "this that"

String can be repeated using *.

# -*- coding: utf-8 -*-
# ruby

print "this" * 2                # thisthis