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End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
class · Ruby 3.0
String
A String object holds and manipulates an arbitrary sequence of bytes, typically representing characters. String objects may be created using String::new or as literals.
Because of aliasing issues, users of strings should be aware of the methods that modify the contents of a String object. Typically, methods with names ending in “!” modify their receiver, while those without a “!” return a new String. However, there are exceptions, such as String#[]=.
Class methods 2
Instance methods 144
#%
#*
#+
#+@
#-@
#<<
#<=>
#==
#===
#=~
#[]
#[]=
#ascii_only?
#b
#bytes
#bytesize
#byteslice
#capitalize
#capitalize!
#casecmp
#casecmp?
#center
#chars
#chomp
#chomp!
#chop
#chop!
#chr
#clear
#codepoints
#concat
#count
#crypt
#delete
#delete!
#delete_prefix
#delete_prefix!
#delete_suffix
#delete_suffix!
#downcase
#downcase!
#dump
#each_byte
#each_char
#each_codepoint
#each_grapheme_cluster
#each_line
#empty?
#encode
#encode!
#encoding
#end_with?
#eql?
#force_encoding
#freeze
#getbyte
#grapheme_clusters
#gsub
#gsub!
#hash
#hex
#include?
#index
#initialize_copy
#insert
#inspect
#intern
#iseuc
#isjis
#issjis
#isutf8
#kconv
#length
#lines
#ljust
#lstrip
#lstrip!
#match
#match?
#next
#next!
#oct
#ord
#partition
#prepend
#replace
#reverse
#reverse!
#rindex
#rjust
#rpartition
#rstrip
#rstrip!
#scan
#scrub
#scrub!
#setbyte
#shellescape
#shellsplit
#size
#slice
#slice!
#split
#squeeze
#squeeze!
#start_with?
#strip
#strip!
#sub
#sub!
#succ
#succ!
#sum
#swapcase
#swapcase!
#to_c
#to_d
#toeuc
#to_f
#to_i
#tojis
#tolocale
#to_r
#to_s
#tosjis
#to_str
#to_sym
#toutf16
#toutf32
#toutf8
#tr
#tr!
#tr_s
#tr_s!
#undump
#unicode_normalize
#unicode_normalize!
#unicode_normalized?
#unpack
#unpack1
#upcase
#upcase!
#upto
#valid_encoding?
Ruby version changes 1
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3.0
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The following methods now return or yield
Stringinstances instead of subclass instances when called on subclass instances: [Bug #10845]
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