yield. #Ruby codepoints how to#
primes_oop.rb: shows how to add a method to an existing The easiest workaround is to let the code as is for 1.8 but only take the first codepoint above (unicode strings can have multiple codepoints per character.). DEV Community is a community of 879,796 amazing developers Were a place where coders share, stay up-to-date and grow their careers. Lecture 4 Ruby: Strings and Regular Expressions How to convert emoji and codepoints each other in Ruby. In my environment, the default encoding object associated with a string us the UTF-8 encoding object. For example: > x Hello World > x.encoding > . We can access the encoding object on the string by calling encoding on the string object. wordcount.rb: uses hashes to count top 10 most frequent In Ruby, strings are a combination of an array of bytes, and an encoding object.filedemo.rb: prints a count of file name extensions, from.sort.rb: a demonstration of sorting in Ruby.
Linesize2.rb (much simpler and faster): prints lines in text The ARGF. Here is an overview, without going into too much detail: UTF-8 uses a dynamic number of bytes: While ASCII characters fit into a single byte, it can use up to 4 bytes for higher codepoints. After the last codepoint of the first file has been returned, the first codepoint of the second file is returned. This method allows you to treat the files supplied on the command line as a single file consisting of the concatenation of each named file. Many of the examples in this section use the File class, the only standard subclass of IO. An I/O stream may be duplexed (that is, bidirectional), and so may use more than one native operating system stream.
linesize1.rb (as presented in lecture), Iterates over each codepoint of each file in ARGF. The IO class is the basis for all input and output in Ruby. Lecture 3 Ruby: Arrays, Slices, and Hashes bits.rb: uses recursion to print all bit strings. ASCII is an encoding with one-byte chars, so in examples in your question methods bytes and codepoints return the same values, coincindentally. wc.rb: a Ruby version of the standard wc Linux command Returns an array of the Integer ordinals of the characters in str. Ruby uses utf-8 encoding by default now and utf-8 was specifically designed so that its first codepoints (0-127) are exactly the same as in ASCII encoding. the encoding is a property of String utf8resume 'Résumé. 
Tested with Ruby 2.4.1 on macOS Sierra 10.12.4. It has proven to save me time by quickly refreshing my memory.
I compiled this list of methods and examples of how to use them.
stats.rb: reads a file of numbers and prints statistics Every time I have to troubleshoot a problem with Unicode, it takes time to go through the documentation.
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