Ruby 2nd book

最新推荐文章于 2022-02-25 20:00:37 发布

最新推荐文章于 2022-02-25 20:00:37 发布 · 120 阅读

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本文深入解析了Ruby语言中各种运算符的工作原理及其实现方式，包括比较运算符、正则表达式匹配等，并通过示例展示了如何使用这些运算符。

Operator Expressions

In Ruby, many operators are actually implemented as method calls.

For example, when you write a*b + c you’re actually asking the object referenced by a to execute the
method * , passing in the parameter b. You then ask the object that results from that
calculation to execute the + method, passing c as a parameter. This is equivalent to
writing :

(a.*(b)).+(c)

Operator          Meaning
==                     Test for equal value.
===                   Used to compare the each of the items with the target in the when clause of a case statement.
<=>                  General comparison operator. Returns −1, 0, or +1, depending on
                         whether its receiver is less than, equal to, or greater than its argument.
<, <=, >=, >    Comparison operators for less than, less than or equal, greater than or
                          equal, and greater than.
=~                     Regular expression pattern match.
eql?                 True if the receiver and argument have both the same type and equal
                         values. 1 == 1.0 returns true, but 1.eql?(1.0) is false.
equal?             True if the receiver and argument have the same object ID.