Ruby common exception

最新推荐文章于 2023-10-14 19:22:18 发布

最新推荐文章于 2023-10-14 19:22:18 发布 · 75 阅读

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本文详细介绍了Ruby编程中常见的七种错误类型，包括RuntimeError、NoMethodError、NameError、IOError、Errno::error、TypeError及ArgumentError，并通过具体的代码示例说明了每种错误产生的原因。

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1, RuntimeError
Reason: This is the default exception raised by the raise method
[code]
raise
[/code]

2, NoMethodError
Reason: An object is sent a message it can't resolve to a method name
[code]
a = Object.new
a.some_unkonw_method_name
[/code]

3, NameError
Reason: The interpreter hits an identifier it can't resolve as a variable or method name
[code]
a = some_random_identifier
[/code]

4, IOError
Reason: This is caused by reading a closed stream, writing to a read-only stream, and similar operations
[code]
STDIN.puts("Don't write to STDIN!")
[/code]

5, Errno::error
Reason: This family of errors relates to file IO
[code]
File.open(-12)
[/code]

6, TypeError
Reason: A method receives an argument it can't handle
[code]
a = 3 + "can't add a string to a number!"
[/code]

7, ArgumentError
Reason: This is caused by using the wrong number of arguments
[code]
def m(x); end; m(1, 2, 3, 4, 5)
[/code]