Ruby Block Comment Syntax

The case of characters in source files is significant. You can use block comments to explain more complicated code or code that you don t expect the reader to be familiar with. But if the last argument of a method is preceded by then you can pass a block to this method and this block will be assigned to the last parameter.

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Modern code editors allow you to select a block of code comment all of it using a keyboard shortcut so there is no extra effort involved.

Ruby block comment syntax.

Comments in ruby begin with a hash mark and continue to the end of the line. The argument names are defined between two pipe characters. It looks like this. The ruby single line comment begins with the character and ends at the end of the line.

You can use the hash character at the beginning of a line i am a comment. That s what block comments are for. You call the test block by using the yield statement. If you have used each before then you have used blocks.

Syntax begin rescue onetypeofexception rescue anothertypeofexception else other exceptions ensure always will be executed end. Blocks are enclosed in a do end statement or between brackets and they can have multiple arguments. Any characters from the character to the end of the line are completely ignored by the ruby interpreter. You can comment multiple lines using begin and end syntax as follows.

It can occur anywhere. Here is an example. A comment hides a line part of a line or several lines from the ruby interpreter. That s exactly how to comment out a block of code in ruby.

The character doesn t necessarily have to occur at the beginning of the line. Usr bin ruby def test yield end test puts hello world this example is the simplest way to implement a block. All syntactic constructs except identifiers and certain literals may be separated by an arbitrary number of whitespace characters and comments. Puts hello ruby when executed the above program produces the following result hello ruby.

These longer form comments apply to some or all of the. Comment syntax and usage. But there s a special multiline comment syntax. Or a comment may be on the same line after a statement or expression.

Ruby blocks are little anonymous functions that can be passed into methods. The character set used in the ruby source files for the current implementation is based on ascii. Initializing ruby program this is main ruby program terminating ruby program ruby comments. We enclose the code that could raise an exception in a begin end block and use rescue clauses to tell ruby the types of exceptions we want to handle.

Usr bin ruby w this is a single line comment.