What does the Ruby method ‘to_sym’ do?

to_sym converts a string to a symbol. For example, "a".to_sym becomes :a.

It’s not specific to Rails; vanilla Ruby has it as well.

It looks like in some versions of Ruby, a symbol could be converted to and from a Fixnum as well. But irb from Ruby 1.9.2-p0, from ruby-lang.org, doesn’t allow that unless you add your own to_sym method to Fixnum. I’m not sure whether Rails does that, but it doesn’t seem very useful in any case.

Related Posts:

  1. What does %w(array) mean?
  2. How to check whether a string contains a substring in Ruby
  3. Ruby array to string conversion
  4. How to delete specific characters from a string in Ruby?
  5. How to convert a string to lower or upper case in Ruby
  6. What is the canonical way to trim a string in Ruby without creating a new string?
  7. Get underlined text with Markdown
  8. What is the meaning of *nix?
  9. Get underlined text with Markdown
  10. What does the “map” method do in Ruby?
  11. How to write a switch statement in Ruby
  12. Rails 5 ActionController::InvalidAuthenticityToken error
  13. what does ? ? mean in ruby
  14. How to update Ruby Version 2.0.0 to the latest version in Mac OSX Yosemite?
  15. How to use “gets” and “gets.chomp” in Ruby
  16. Getting a substring in Ruby by x number of chars
  17. Ruby: How to install a specific version of a ruby gem?
  18. ruby operator “=~” [duplicate]
  19. What is attr_accessor in Ruby?
  20. ActionController::UnknownFormat
  21. What does ||= (or-equals) mean in Ruby?
  22. How to read lines of a file in Ruby
  23. Array to Hash Ruby
  24. Ruby: undefined method `[]’ for nil:NilClass when trying to get Enumerator on an Array of Hashes
  25. How to map with index in Ruby?
  26. Ruby equivalent for Python’s “try”?
  27. What does “+=” (plus equals) mean?
  28. Rails 4 RoutingError: No Route Matches
  29. How to sum array of numbers in Ruby?
  30. How to check if a value exists in an array in Ruby
  31. undefined method (NoMethodError) ruby
  32. Multi-Line Comments in Ruby?
  33. How to uninstall ruby installed by ruby-install
  34. PG::ConnectionBad – could not connect to server: Connection refused
  35. Rails syntax error : unexpected keyword_ensure, expecting end-of-input
  36. Removing all installed Gems and starting over
  37. Ruby `send` vs `call` method
  38. What is the meaning of “do | |” in Ruby?
  39. RVM is not a function, selecting rubies with ‘rvm use …’ will not work
  40. Ruby: kind_of? vs. instance_of? vs. is_a?
  41. Rails: I installed Ruby, now “bundle install” doesn’t work
  42. How to do a newline in output
  43. Ruby: What is the easiest way to remove the first element from an array?
  44. Ruby String to Date Conversion
  45. p vs puts in Ruby
  46. Determining type of an object in ruby
  47. Fizz Buzz in Ruby for dummies
  48. How to Uninstall RVM? [duplicate]
  49. What is the “right” way to iterate through an array in Ruby?
  50. What is the difference between a Process’ pid, ppid, uid, euid, gid and egid?
  51. Equivalent of “continue” in Ruby
  52. Difference between map and collect in Ruby?
  53. Creating and iterating a 2d array in Ruby
  54. What is the best way to convert an array to a hash in Ruby
  55. Ruby 2.0.0p0 IRB warning: “DL is deprecated, please use Fiddle”
  56. Getting error: dyld: Symbol not found: _clock_gettime
  57. Uninstall old versions of Ruby gems
  58. Meaning of #{ } in Ruby?
  59. Uploading a file in Rails
  60. What is java interface equivalent in Ruby?
  61. Sort hash by key, return hash in Ruby
  62. Gem installation error: You have to install development tools first
  63. How to understand strptime vs. strftime
  64. How can I delete one element from an array by value
  65. How to break out from a ruby block?
  66. ERROR: While executing gem … (Gem::FilePermissionError)
  67. No such file or directory @ rb_sysopen ruby
  68. How to add to an existing hash in Ruby
  69. Ruby ‘require’ error: cannot load such file
  70. Difference between $stdout and STDOUT in Ruby
  71. How to count instances of character in SQL Column
  72. No implicit conversion of String into Integer (TypeError)?
  73. Multi-Line Comments in Ruby?
  74. Print string to text file
  75. Java String Split by “|”
  76. Array to String PHP?
  77. What is a “method” in Python?
  78. How do I append one string to another in Python?
  79. How do I create an array of strings in C?
  80. What is use of c_str function In c++
  81. How do I properly compare strings in C?
  82. C++ Parsing input string to variables
  83. Can I multiply strings in Java to repeat sequences?
  84. Java way to check if a string is palindrome
  85. Read whole ASCII file into C++ std::string
  86. AttributeError: ‘list’ object has no attribute ‘replace’ when trying to remove character
  87. Converting string to Date and DateTime
  88. What is the easiest/best/most correct way to iterate through the characters of a string in Java?
  89. How do I check if string contains substring?
  90. Data argument not used by format strings in C
  91. std::wstring VS std::string
  92. Replacing a character from a certain index
  93. Removing trailing newline character from fgets() input
  94. Create nice column output in python
  95. TypeError: decoding str is not supported
  96. The difference between char * and char[] [duplicate]
  97. Python-like list comprehension in Java
  98. Append a single character to a string or char array in java?
  99. Unrecognized escape sequence for path string containing backslashes
  100. Convert JsonObject to String

Leave a Comment

deneme bonusu veren sitelerbahis casinomakrobetceltabetpinbahispolobetpolobet girişpinbahis girişmakrobet girişpulibet girişmobilbahis girişkolaybet giriş