Meteor JS is very reactive mean to say that any modification to your data is automatically reflected everywhere throughout the app which also includes the user interface without callbacks. This can be called powerful feature. Imagine adding a task to a to-do list and with reactivity, you don’t need a callback while inserting the new HTML element into the list. As soon as Meteor receives the new entry, it automatically publicizes the change to the user interface, without any interference on your part!
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