Zones and Change Detection
Let’s see how zones help with running change detection.
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Zones
Zones are a new concept to JavaScript, but they were a core language feature in Dart, a language Google created to replace JavaScript. Dart never gained traction, but zones made their way over to the JavaScript ecosystem to be a foundational part of Angular.
In short, zones are a way to wrap asynchronous code into a single context.
Let’s say you wanted to figure out how long an AJAX call took with regard to code execution time on the frontend. Something like this wouldn’t work:
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