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MongoDB/NoSQL: Keeping Document Change History
...his approach is fine though when you're dealing with small-sized documents and/or don't update documents very often.
Only store changes in a new version
Another approach would be to store only the changed fields in a new version. Then you can 'flatten' your history to reconstruct any version of th...
Clojure differences between Ref, Var, Agent, Atom, with examples
...here to use Ref, Var, Agent, Atom. I read book, but, still couldn't understand the real world examples.
5 Answers
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Rounded UIView using CALayers - only some corners - How?
...the answer over at How do I create a round cornered UILabel on the iPhone? and the code from How is a rounded rect view with transparency done on iphone? to make this code.
Then I realized I'd answered the wrong question (gave a rounded UILabel instead of UIImage) so I used this code to change it:...
How to evaluate a math expression given in string form?
...ntext with user input. The executed JavaScript can access all Java classes and thus hijack your application without limit.
– Boann
Sep 21 '15 at 11:08
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How to create a checkbox with a clickable label?
...ince the other answers don't mention it, a label can include up to 1 input and omit the for attribute, and it will be assumed that it is for the input within it.
Excerpt from w3.org (with my emphasis):
[The for attribute] explicitly associates the label being defined with another control. When pres...
Pandas selecting by label sometimes return Series, sometimes returns DataFrame
In Pandas, when I select a label that only has one entry in the index I get back a Series, but when I select an entry that has more then one entry I get back a data frame.
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In Ruby on Rails, what's the difference between DateTime, Timestamp, Time and Date?
..., getting dates/times right when programming is always fraught with danger and difficulity.
3 Answers
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Java code To convert byte to Hexadecimal
...g.format solution more preferrable.
References
JLS 4.2.1 Integral Types and Values
For byte, from -128 to 127, inclusive
JLS 5.1.2 Widening Primitive Conversion
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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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Swift class introspection & generics
...ype is a declaration but MyObject.self is a factory method (can be called) and myObject is a variable containing a reference to a factory method. The call myObject() would produce an instance of class MyObject. It would be better example if the name of myObject variable was myObjectFactory?
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