For the professional developer in 2025, mastery of JavaScript is no longer sufficient. One must also master the meta-language of the prompt, becoming not just a writer of code, but an architect of intelligence. The prompt "Act as a Senior JavaScript Developer" has achieved canonical status within the community. Superficially, this appears to be a role-playing request. However, at a mechanistic level, this prompt functions as a powerful contextual filter. #Prompts