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Singleton with Arguments in Java
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A singleton, by definition, is an object you want to be instantiated no more than once. If you are trying to feed parameters to the constructor, what is the point of the singleton?
You have two options. If you want your singleton to be initialized with some data, you may load it with data after ...
Advantages of Binary Search Trees over Hash Tables
...y Search Trees (reference-based) are memory-efficient. They do not reserve more memory than they need to.
For instance, if a hash function has a range R(h) = 0...100, then you need to allocate an array of 100 (pointers-to) elements, even if you are just hashing 20 elements. If you were to use a bin...
PostgreSQL DISTINCT ON with different ORDER BY
...ND t1.purchased_at = t2.max_purchased_at
ORDER BY t1.purchased_at DESC
A more PostgreSQL-oriented solution based on @hkf's answer:
SELECT * FROM (
SELECT DISTINCT ON (address_id) *
FROM purchases
WHERE product_id = 1
ORDER BY address_id, purchased_at DESC
) t
ORDER BY purchased_at DESC
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How to return an empty ActiveRecord relation?
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JPA or JDBC, how are they different?
...ur application which can make your life much easier. JDBC allows you to do more things with the Database directly, but it requires more attention. Some tasks can not be solved efficiently using JPA, but may be solved more efficiently with JDBC.
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What are “sugar”, “desugar” terms in context of Java 8?
I hear about 'sugaring' and 'desugaring' more often in Java 8, what does these terms mean ? are they conceptual or syntactical.
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Git branching strategy integated with testing/QA process
...be in a releasable state. The long version is that we test in many phases. More analytically:
Developer creates a feature branch for every new feature.
The feature branch is (automatically) deployed on our TEST environment with every commit for the developer to test.
When the developer is done wi...
JavaScript Regular Expression Email Validation [duplicate]
...valid username characters such as dash and plus; 2) disallows domains with more than 2 parts, found in many ccTLDs, such as geek.co.il; 3) disallows many of the new TLDs that use 4 or more characters, such as mobi and info; 4) doesn't support IDN at all.
– Guss
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How to check a radio button with jQuery?
... call click() or change() on the radio button afterwards. See comments for more info.
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@selector() in Swift?
...ath(#keyPath(Person.friends.firstName)). See SE-0062 for details. And even more KeyPath stuff in Swift 4, so make sure you're using the right KeyPath-based API instead of selectors if appropriate.
You can read more about selectors under Interacting with Objective-C APIs in Using Swift with Cocoa and...