Haskell: how to map a tuple?
Here’s a rather short point-free solution: import Control.Monad (join) import Control.Arrow ((***)) mapTuple = join (***)
mapping
What the equivalent of activity life cycle in iOS?
This is a comparison between the lifecycle of Android vs iOS: Note: viewDidUnload is deprecated after iOS 6
Class that acts as mapping for **unpacking
The __getitem__() and keys() methods will suffice: >>> class D: def keys(self): return [‘a’, ‘b’] def __getitem__(self, key): return key.upper() >>> def f(**kwds): print kwds >>> f(**D()) {‘a’: ‘A’, ‘b’: ‘B’}
Simple way to subset SpatialPolygonsDataFrame (i.e. delete polygons) by attribute in R
looks like you’re overwriting the data, but not removing the polygons. If you want to cut down the dataset including both data and polygons, try e.g. world.map <- world.map[world.map$AREA > 30000,] plot(world.map) [[Edit 19 April, 2016]] That solution used to work, but @Bonnie reports otherwise for a newer R version (though perhaps the data has … Read more
What is the meaning of a at the end of some vim mappings?
:help key-notation says: notation meaning equivalent decimal value(s) ———————————————————————– <CR> carriage return CTRL-M 13 *carriage-return* <Return> same as <CR> *<Return>* <Enter> same as <CR> *<Enter>* Mappings often involve Ex commands and you must press <CR> to execute them so it’s included in the mapping.
Class Mapping Error: ‘T’ must be a non-abstract type with a public parameterless constructor
The problem is that you’re trying to use the T from SqlReaderBase as the type argument for MapperBase – but you don’t have any constraints on that T. Try changing your SqlReaderBase declaration to this: public abstract class SqlReaderBase<T> : ConnectionProvider where T : new() Here’s a shorter example which demonstrates the same issue: class … Read more
Flutter Pub: Expected a key while parsing a block mapping. path:
Spaces are significant in YAML assets is indented too far flutter_test: sdk: flutter flutter: uses-material-design: true assets: – loadjson/person.json
Can I use SPACE as mapleader in VIM?
Try the following instead: let mapleader=” ” And remember to write the following line before that, to make sure spacebar doesn’t have any mapping beforehand: nnoremap <SPACE> <Nop>
Elasticsearch : Root mapping definition has unsupported parameters index : not_analyzed
You’re almost here, you’re just missing a few things: PUT /test { “mappings”: { “type_name”: { <— add the type name “properties”: { <— enclose all field definitions in “properties” “field1”: { “type”: “integer” }, “field2”: { “type”: “integer” }, “field3”: { “type”: “string”, “index”: “not_analyzed” }, “field4,”: { “type”: “string”, “analyzer”: “autocomplete”, “search_analyzer”: “standard” … Read more
Deserialize JSON to ArrayList using Jackson
You can deserialize directly to a list by using the TypeReference wrapper. An example method: public static <T> T fromJSON(final TypeReference<T> type, final String jsonPacket) { T data = null; try { data = new ObjectMapper().readValue(jsonPacket, type); } catch (Exception e) { // Handle the problem } return data; } And is used thus: final … Read more