Ruby Block Comment Syntax

Usr bin ruby w this is a single line comment. The character doesn t necessarily have to occur at the beginning of the line. It can occur anywhere.

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You can comment multiple lines using begin and end syntax as follows.

Ruby block comment syntax.

The argument names are defined between two pipe characters. You can use the hash character at the beginning of a line i am a comment. It looks like this. That s exactly how to comment out a block of code in ruby.

Comment syntax and usage. Blocks are enclosed in a do end statement or between brackets and they can have multiple arguments. If you have used each before then you have used blocks. All syntactic constructs except identifiers and certain literals may be separated by an arbitrary number of whitespace characters and comments.

You call the test block by using the yield statement. 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. Puts hello ruby when executed the above program produces the following result hello ruby.

Usr bin ruby def test yield end test puts hello world this example is the simplest way to implement a block. 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. Here is an example. 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.

That s what block comments are for. Ruby blocks are little anonymous functions that can be passed into methods. Comments in ruby begin with a hash mark and continue to the end of the line. Or a comment may be on the same line after a statement or expression.

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. You can use block comments to explain more complicated code or code that you don t expect the reader to be familiar with. But there s a special multiline comment syntax. A comment hides a line part of a line or several lines from the ruby interpreter.

Any characters from the character to the end of the line are completely ignored by the ruby interpreter. Initializing ruby program this is main ruby program terminating ruby program ruby comments. Syntax begin rescue onetypeofexception rescue anothertypeofexception else other exceptions ensure always will be executed end. These longer form comments apply to some or all of the.

The case of characters in source files is significant.