Great solutions to common problems - Lasso Cook Book

This section houses many solutions to different talks/problems.

Here is a simple example

Why use this code

  if: (field:'cat') == '';

instead of this code

  if: !(field:'cat');

The ! symbol represents a boolean operation and the [Field] tag returns a string. So, when you use (!string) you are relying on the implicit cast of string to boolean and then inverting that. Whereas, when you do (string == '') you are comparing two strings and always know what is going to happen.

For example, (!'false') returns True because the string 'false' is cast to the Boolean value False, but ('false' == '') returns False since it's actually a string comparison.

Author: Fletcher Sandbeck
Created: 25 Feb 2010
Last Modified: 16 Mar 2011