Template Literals

The key feature of tagged templates that allows them to handle template literals more flexibly is that they receive both the string parts and expression results as separate arguments. Unlike simple string methods that would only see the final concatenated string, a tag function receives the static string parts as an array in its first parameter, and the evaluated expression results as subsequent parameters (or as an array with rest parameters). This separation gives tag functions complete information about the structure of the original template, allowing for sophisticated processing such as context-aware escaping, dynamic formatting based on both the static text and expression values, or even building entirely different data structures from the template. This can't be achieved with regular string methods because once a regular template literal is evaluated, the information about which parts were static and which were expressions is lost.