Ramda merge (concat) multiple lists
const mergelists = R.unapply(R.reduce(R.concat, []))
For example when using with the converge
method to merge the results:
const megalist = R.converge(
R.unapply(R.reduce(R.concat, [])),
[R.identity, R.identity, R.identity])
megalist([1]) // [1,1,1]
source: stack overflow