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Does Go have “if x in” construct similar to Python?
...:
visitedURL := map[string]bool {
"http://www.google.com": true,
"https://paypal.com": true,
}
if visitedURL[thisSite] {
fmt.Println("Already been here.")
}
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What is the explicit promise construction antipattern and how do I avoid it?
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How do I catch a numpy warning like it's an exception (not just for testing)?
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How to differentiate between time to live and time to idle in ehcache
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Maven: how to override the dependency added by a library
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Checking if an instance's class implements an interface?
...
Added some dots to actually "feel" see the difference.
Generated by this: https://3v4l.org/8Cog7
Conclusion
In case you have an object to check, use instance of like mentioned in the accepted answer.
In case you have a class to check, use is_a.
Bonus
Given the case you want to instantiate a class b...
Rails has_many with alias name
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Java to Clojure rewrite
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Chrome debugging - break on next click event
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SignalR: Why choose Hub vs. Persistent Connection?
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