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As one step towards #1819, we've created MapMutator, which can take a bunch of (what would normally be) Map.Set() calls and batch them up to be applied all at once. The keys and values are held in a LevelDB cache until everything's done. Usage looks like this: m := types.NewMap() mx := m.Mx() mx = mx.Set(String("foo"), String("bar")).Set(String("baz"), Number(42)) m = mx.Finish() We intend to make this the only way to modify collections, but at first this will only work on an empty NomsMap.
CSV Importer
Imports a CSV file as List<T> where T is a struct with fields corresponding to the CSV's column headers. The struct spec can also be set manually with the -header flag.
Usage
$ cd csv-import
$ go build
$ ./csv-import http://localhost:8000:foo <PATH>
Some places for CSV files
- https://data.cityofnewyork.us/api/views/kku6-nxdu/rows.csv?accessType=DOWNLOAD
- http://www.opendatacache.com/
CSV Exporter
Export a dataset in CSV format to stdout with column headers.
Usage
$ cd csv-export
$ go build
$ ./csv-export http://localhost:8000:foo