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Good scalaz introduction [closed]
...recommend you to read through http://apocalisp.wordpress.com/ (blog driven by Runar Oli and Mark Harrah) and the weblog of Tony Morris
UPD: "Functors, Applicative Functors and Monoids" chapter of "Learn You a Haskell for Great Good!" has a lot of examples in Haskell with detailed explanations, whic...
Reverse Range in Swift
...i in (1...5).reversed() { print(i) } // 5 4 3 2 1
Or stride(from:through:by:) method
for i in stride(from:5,through:1,by:-1) { print(i) } // 5 4 3 2 1
stide(from:to:by:) is similar but excludes the last value
for i in stride(from:5,to:0,by:-1) { print(i) } // 5 4 3 2 1
Update For latest Swif...
Are the shift operators () arithmetic or logical in C?
... for those readers unfamiliar with the difference, a "logical" right shift by 1 bit shifts all the bits to the right and fills in the leftmost bit with a 0. An "arithmetic" shift leaves the original value in the leftmost bit. The difference becomes important when dealing with negative numbers.)
Whe...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...s detection, such as two-finger rotation, and user-defined custom gestures by building extension components. Our paper illustrates the implementation of components, sample usage of the components and how they will help novices building apps involving gesture recognition.
KEYWORDS
System, Computer ...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...s detection, such as two-finger rotation, and user-defined custom gestures by building extension components. Our paper illustrates the implementation of components, sample usage of the components and how they will help novices building apps involving gesture recognition.
KEYWORDS
System, Computer ...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...s detection, such as two-finger rotation, and user-defined custom gestures by building extension components. Our paper illustrates the implementation of components, sample usage of the components and how they will help novices building apps involving gesture recognition.
KEYWORDS
System, Computer ...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...s detection, such as two-finger rotation, and user-defined custom gestures by building extension components. Our paper illustrates the implementation of components, sample usage of the components and how they will help novices building apps involving gesture recognition.
KEYWORDS
System, Computer ...
What does .SD stand for in data.table in R
...elp you see what .SD is:
DT[ , .SD[ , paste(x, v, sep="", collapse="_")], by=y]
# y V1
# 1: 1 a1_b3_c5
# 2: 3 a2_b4_c6
Basically, the by=y statement breaks the original data.table into these two sub-data.tables
DT[ , print(.SD), by=y]
# <1st sub-data.table, called '.SD' while it's be...
Which Java Collection should I use?
...Commons Attribution 4.0 International License. The simplest attribution is by linking to either this question or this answer.
Other resources
Probably the most useful other reference is the following page from the oracle documentation which describes each Collection.
HashSet vs TreeSet
There is ...
SQL selecting rows by most recent date
...
You can use a GROUP BY to group items by type and id. Then you can use the MAX() Aggregate function to get the most recent service month. The below returns a result set with ChargeId, ChargeType, and MostRecentServiceMonth
SELECT
CHARGEID,
...