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Differences between ExpandoObject, DynamicObject and dynamic
What are the differences between System.Dynamic.ExpandoObject , System.Dynamic.DynamicObject and dynamic ?
4 Answers
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Should I use tag for icons instead of ? [closed]
Facebook's HTML and Twitter Bootstrap HTML (before v3) both use the <i> tag to display icons.
7 Answers
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When would anyone use a union? Is it a remnant from the C-only days?
...pace to work with, or when you're developing an API (or something similar) and you want to force the end user to have only one instance of several objects/types at one time. Are these two guesses even close to right?
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Left Align Cells in UICollectionView
...ct a new line by inspecting the Y position of the new element. Very simple and quick in performance.
Swift:
class LeftAlignedCollectionViewFlowLayout: UICollectionViewFlowLayout {
override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
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Skip List vs. Binary Search Tree
...node need to be locked.
Update from Jon Harrops comments
I read Fraser and Harris's latest paper Concurrent programming without locks. Really good stuff if you're interested in lock-free data structures. The paper focuses on Transactional Memory and a theoretical operation multiword-compare-an...
How to read the output from git diff?
The man page for git-diff is rather long, and explains many cases which don't seem to be necessary for a beginner. For example:
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How dangerous is it to compare floating point values?
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First of all, floating point values are not "random" in their behavior. Exact comparison can and does make sense in plenty of real-world usages. But if you're going to use floating point you need to be aware of how it works. Erring on the side of assuming floating point ...
Reverse a string in Python
...tended slice syntax. It works by doing [begin:end:step] - by leaving begin and end off and specifying a step of -1, it reverses a string.
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When to use EntityManager.find() vs EntityManager.getReference() with JPA
...nager.getReference(LObj.getClass(), LObj.getId()) to get a database entity and then pass the returned object to be persisted in another table.
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App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
...wVersion)
This event fires when the database is downgraded. The previous and new version numbers are provided. Use this event to modify the database as required by the version change.
DatabaseOpened()
当数据库打开时，会触发此事件。
DatabaseUpgrade(oldVersion,newVersion)
This...