User Guide

126 Chapter 6: Extending ColdFusion Pages with CFML Scripting
Statement blocks
Curly brace characters ({ and }) group multiple CFScript statements together so that they are
treated as a single unit or statement. This enables you to create code blocks in conditional
statements, such as the following:
if(score GT 0) {
result = "positive";
Positives = Positives + 1;
}
In this example, both assignment statements are executed if the score is greater than 0. If they
were not in the code block, only the first line would execute.
You do not have to put brace characters on their own lines in the code. For example, you could
put the open brace in the preceding example on the same line as the
if statement, and some
programmers use this style. However, putting at least the ending brace on its own line makes it
easier to read the code and separate out code blocks.
Comments
CFScript has two forms of comments: single line and multiline.
A single line comment begins with two forward slashes (//) and ends at the line end; for example:
//This is a single-line comment.
//This is a second single-line comment.
A multiline comment starts with a /* marker and continues until it reaches a */ marker; for
example:
/*This is a multiline comment.
You do not need to start each line with a comment indicator.
This is the last line in the comment. */
The following rules apply to comments:
• Comments do not have to start at the beginning of a line. They can follow active code on a
line. For example, the following line is valid:
MyVariable = 12; // Set MyVariable to the default value.
• The end of a multiline comment can be followed on the same line by active code. For example,
the following line is valid, although it is poor coding practice:
End of my long comment */ foo = "bar";
• You can use multiline format for a comment on a single line, for example:
/*This is a single line comment using multiline format. */
• You cannot nest /* and */ markers inside other comment lines.
• CFML comments (<!--- and --->) do not work in CFScript.