Ruby Block Comment Syntax

Ruby blocks are little anonymous functions that can be passed into methods. 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. You can use the hash character at the beginning of a line i am a comment.

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Blocks are enclosed in a do end statement or between brackets and they can have multiple arguments.

Ruby block comment syntax. The character doesn t necessarily have to occur at the beginning of the line. It looks like this. Comments in ruby begin with a hash mark and continue to the end of the line. A comment hides a line part of a line or several lines from the ruby interpreter.

That s what block comments are for. All syntactic constructs except identifiers and certain literals may be separated by an arbitrary number of whitespace characters and comments. If you have used each before then you have used blocks. You can comment multiple lines using begin and end syntax as follows.

Usr bin ruby w this is a single line comment. Puts hello ruby when executed the above program produces the following result hello ruby. Any characters from the character to the end of the line are completely ignored by the ruby interpreter. Comment syntax and usage.

It can occur anywhere. Or a comment may be on the same line after a statement or expression. Usr bin ruby def test yield end test puts hello world this example is the simplest way to implement a block. 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.

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. These longer form comments apply to some or all of the. You call the test block by using the yield statement. The argument names are defined between two pipe characters.

The case of characters in source files is significant. Syntax begin rescue onetypeofexception rescue anothertypeofexception else other exceptions ensure always will be executed end. But there s a special multiline comment syntax. Here is an example.

Initializing ruby program this is main ruby program terminating ruby program ruby comments. The character set used in the ruby source files for the current implementation is based on ascii. The ruby single line comment begins with the character and ends at the end of the line. You can use block comments to explain more complicated code or code that you don t expect the reader to be familiar with.

That s exactly how to comment out a block of code in ruby.