Calmm-js Snippets

_prepare_and_set_new_atom.js

const obsv = someObservable // stream, atom, etc.
const record = U.view( 'record', obsv )

const nameDefault = 'nobody'
const nameL = 'name' 
const defaultsTemplate = { /* some defaults*/ }

obsv.onValue(
  R.pipe( L.transform( [ nameL
                       , L.when( R.isNil )
                       , L.setOp( nameDefault )
                       ]
                     )
          // ^^^ Applies a default value to a single property at transform focus  ('name')

          // Apply a template of default values via merge
          // R.deepMerge is not yet available in the boilerplate
        , L.modify( 'iNeedDefaults'
                  , R.merge( defaultsTemplate )
                  )

          // Set the atom
        , R.tap( x => record.set( x ) ) // keep the lambda
          // The lamda is necessary, for some reason
          // I'm using R.tap here in case we need to continue working with the data
        )  
)