JavaScript - Arrays - Observe


// JavaScript - Array.observe(): obsolete
The Array.observe() method was used for asynchronously observing changes to 
Arrays, similar to Object.observe() for objects. It provided a stream of changes 
in order of occurrence. It's equivalent to Object.observe() invoked with the 
accept type list ["add", "update", "delete", "splice"]. However, this API has 
been deprecated and removed from Browsers. You can use the more general 
Proxy object instead.
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