Code Samples

The code samples in this book predominantly consist of ColdFusion Markup Language (CFML). I chose CFML because it has a large overlap with other languages; so, the syntax should feel very familiar to most programmers. But, it has the added benefit of optional named-arguments and type-checking in its method invocation, which allows me to more clearly articulate how data is being passed-around.

CFML also has both a Script-based syntax and a Tag-based syntax, which allows the same language to be used seamlessly in both View-template rendering and back-end business logic. For example, I can use a traditional if statement for Script-based control flow and a <cfif> tag to conditionally render HTML blocks.

One of the biggest differences between CFML and other languages is that arrays are 1-based. Meaning, the first index is 1, not 0.

CFML is a server-side programming language. And the vast majority of the code in this book represents server-side logic. But, I also have references to HTML, JavaScript, and Angular. And, I do use JSON quite heavily to represent a feature flag's configuration.

Ultimately, feature flags are not language-specific. They embody a programming and product development paradigm that can be applied in any language. And, each language is going to have its own implementation details. As such, you should feel free to treat the code in this book as pseudo code that is provided for illustrative purposes.