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string = 'proton neutron'
string.capitalize # Proton neutron
string.upcase # PROTON NEUTRON
string.downcase # proton neutron
string.center(20, '.') # ...proton neutron...
# capitalize each word
string.split.map(&:capitalize).join(' ') # Proton Neutron
# is string numeric
string.is_a?(Numeric) # false
# is string uppercase or lowercase require custom methods
class String
def is_upper?
self == self.upcase
end
def is_lower?
self == self.downcase
end
end
string.is_upper? # false
string.is_lower? # true
# count characters in string
string.count('t') # 2
# count string in string
string.scan(/on/).count # 2
# find character index in string
string.index('r') # 1
# remove whitespace
string = ' some text '
string.lstrip # 'some text '
string.rstrip # ' some text'
string.strip # 'some text'
# interpolation
a = 5
b = 3
string = "#{a} times #{b} is equal to #{a * b}"
# 5 times 3 is equal to 15
# substitution
string = "some text, random text, to substitute"
string.sub 'text', 'string' # some string, random text, to substitute
string.gsub 'text', 'string' # some string, random string, to substitute
# replace characters
string[0..3] = "this" # this text, random text, to substitute
'''
Michael Sjoeberg
2018-11-07
https://github.com/michaelsjoeberg/ruby-playground/blob/master/basic-syntax/string-operations.rb
'''
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