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What does 'require: false' in Gemfile mean?
... bundler/setup
which is called by bundle exec
Example
Gemfile
source 'https://rubygems.org'
gem 'haml'
gem 'faker', require: false
main.rb
# Fail because we haven't done Bundler.require yet.
# bundle exec does not automatically require anything for us,
# it only puts them in the require path...
How do I exclude all instances of a transitive dependency when using Gradle?
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Find a Git branch containing changes to a given file
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What does new self(); mean in PHP?
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What's the difference between window.location= and window.location.replace()?
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What is a MIME type?
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Python: fastest way to create a list of n lists
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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...
Entity Framework 4 / POCO - Where to start? [closed]
...
There are also these tutorials:
https://danielwertheim.wordpress.com/2010/05/16/entity-framework-4-ctp3-code-first-vs-linq-to-sql/
https://danielwertheim.wordpress.com/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/
...
How do you remove a Cookie in a Java Servlet
... are necessary to clear the cookie properly.
private void eraseCookie(HttpServletRequest req, HttpServletResponse resp) {
Cookie[] cookies = req.getCookies();
if (cookies != null)
for (Cookie cookie : cookies) {
cookie.setValue("");
cookie.setPath("/");
...