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What is the difference between an interface and abstract class?
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Last comparison is confusing as per table! Methods in interface can't be static but variables are static final Implemented methods in abstract class can be static
– realPK
Mar 9 '14 at 4:29
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What is the difference between '>' and a space in CSS selectors?
...e child selector is not supported by IE 6 and lower. A great compatibility table is here.
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Create list of single item repeated N times
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Create List of Single Item Repeated n Times in Python
Immutable items
For immutable items, like None, bools, ints, floats, strings, tuples, or frozensets, you can do it like this:
[e] * 4
Note that this is best only used with immutable items (strings, tuples, frozensets, ) in th...
SQLite Concurrent Access
...ions to minimize contention. Especially SQLite 3.
For most desktop/laptop/tablet/phone applications, SQLite is fast enough as there's not enough concurrency. (Firefox uses SQLite extensively for bookmarks, history, etc.)
For server applications, somebody some time ago said that anything less than ...
Java Persistence / JPA: @Column vs @Basic
...ns give clues on how to map the pure theoretical model to a real database: Table, Column, ... In your question 'Basic' is an annotation to provide information about the relational entity attribute while 'Column' provides information on how to map it to a database column.
– Brun...
What is a reasonable order of Java modifiers (abstract, final, public, static, etc.)?
...: I replaced "specified/recommended" with "customary" to make this an acceptable answer. Take this into account if you read the comments ;-) (thanks @EJP to make this clear) - Nevertheless I would recommend to use the customary order.
Google also recommends using the customary order mentioned in the...
Why use 'virtual' for class properties in Entity Framework model definitions?
... nullable Foreign Key in SQL. You do not HAVE to eagerly join every keyed table when performing a query, but when you need the information -- it becomes demand-driven.
I also mentioned nullable because many navigation properties are not relevant at first. i.e. In a customer / Orders scenario, y...
How is a CRC32 checksum calculated?
...for computing a CRC: an algebraic approach, a bit-oriented approach, and a table-driven approach. In Reversing CRC - Theory and Practice*, each of these three algorithms/approaches is explained in theory accompanied in the APPENDIX by an implementation for the CRC32 in the C programming language.
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What is the JavaScript >>> operator and how do you use it?
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+2 in depth description and table, -1 because array.length validates itself and can't be arbitrarily set to anything that is not an integer or 0 (FF throws this error: RangeError: invalid array length).
– Justin Johnson
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Which equals operator (== vs ===) should be used in JavaScript comparisons?
... between == and ===.
Source: http://dorey.github.io/JavaScript-Equality-Table/
var1 === var2
When using === for JavaScript equality testing, everything is as is. Nothing gets converted before being evaluated.
var1 == var2
When using == for JavaScript equality testing, some
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