What is Javascript Mixins in Magento 2?
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- Mixin is an alternative to inheritance, without overriding the entire base file, You can add new methods or change/modify the current method output in the mixins file.
- Mixins is a class that contains methods for use by other classes without having to be the parent class of those other classes.
- Class Methods are added to or mixed in with parent class methods.

It’s really useful article for extending js file instead of override.
Thank you @RakeshJesadiya Keep doing same.
@disqus_6YZW9WTlVt:disqus Thanks for your kind words.