Mac update ruby
The super invokes the method which the current method Invocations (the forms that omits receiver). Some methods are private, and can be called from function form Value of the expression, which must be a Proc object, is If the last argument expression preceded by &, the Of the expression expanded to arguments, that means If the last argument expression preceded by *, the value Identifier! are used for the more destructive (or moreĭangerous) methods than the method which have same name without Identifier? are used as predicate names, and Identifier names are normal identifiers and identifier suffixed by Receiver specified, self is used as a receiver. Hand side expression of the dot) specified by the identifier. Method invocation expression invokes the method of the receiver (right Returns a new Hash object, which maps each key to corresponding value. In double-quoted strings, regular expressions, and command outputĮxpressions, the form like "# Turns on (or off) `i' and `x' options within this non-capturing group.īackslash notation and expression substitution available in regular These modifiers are localized inside an enclosing group (if any).
Turns on (or off) `i' and `x' options within regular expression. The %r/STRING/ is the another form of the regularĮnd of a string, or before newline at the endĠ or more previous regular expression(non greedy)ġ or more previous regular expression(non greedy)Īt least m but most n previous regular expressionĪt least m but most n previous regular expression(non greedy) Newlines are treated as normal character (matches with dots).
Option x means extended regularĮxpression, which means whitespaces and commens are allowd in theĮxpression. Option i means that regular expression doesĮxpression substitution only once at the first Option i means that regular expression is case Right after latter slash denotes the option to the regular expression. Strings delimited by slashes are regular expressions. The %x/STRING/ is the another form of the command output Standard output from the commands are taken as the value. Strings delimited by backquotes are performed by a subshell afterĮscape sequences interpretation and expression substitution. The string literal expression yields new string object each time it Of the closing bracket need to be backslashed as usual.) Is an opening bracket or parenthesis, the final delimiter will be theĬorresponding closing bracket or parenthesis. The %Q/STRING/ (or %/STRING/) expression is %q/STRING/ expression is the generalized single quote. To avoid putting too many backslashes into quoted strings. The string expressions begin with % are the special form Single-quoted strings are not (except for String expressions begin and end with double or single quote marks.ĭouble-quoted string expressions are subject to backslash escape andĮxpression substitution. Ruby expressions can be grouped by parentheses. Each expression areīackslashes at the end of line does not terminate expression. Ruby programs are sequence of expressions. Through and including a line that begins with =end. =begin, it skips that line and all remaining lines If the Ruby interpreter encounters a line beginning with That with `=end' will be skipped by the interpreter. The everything between a line beginning with `=begin' and String or character literal ( ?#) and allįollowing text until the end of the line. Ruby comments start with " #" outside of a There are no restrictions on the lengths of Ruby Underscore character, and begin with a alphabets(including Ruby identifiers are consist of alphabets, decimal digits, and the Works as whitespace only when expressions obviously continues to the Vertical tab, backspace, carriage return, and form feed. The whitespace characters are space, tab, All syntactic constructs except identifiers andĬertain literals may be separated by an arbitrary number of whitespaceĬharacters and comments. The case of characters in sourceįiles is significant. The character set used in the Ruby source files for the current line-oriented string literals (Here document).