Play ramdajs

var R = require('ramda'); const isPromise = R.both(R.is(Object), R.pipe(R.prop('then'), R.is(Function))); const propIsNull = R.curry(R.pipe(R.prop, R.isNil)); const hasPropThatNotNull = R.complement(propIsNull); const hasPropThatIsString = R.curry(R.pipe(R.prop, R.is(String))); const hasPropAThatIsString = hasPropThatIsString('a'); const hasPropThatIsString2 = R.o(R.o(R.is(String)))(R.prop); hasPropThatIsString('a');