We'll learn how to take advantage of Ramda's automatic function currying and data-last argument order to combine a series of pure functions into a left-to-right composition, or pipeline, with Ramda's pipe function.

 

A simple example will take 'teams' array and output the best score team's name. We use 'R.sort', 'R.head' and 'R.prop' to get job done:

const teams = [  {name: 'Lions', score: 5},  {name: 'Tigers', score: 4},  {name: 'Bears', score: 6},  {name: 'Monkeys', score: 2},];const getTopName = function(teams){  const sorted = R.sort( (a,b) => b.score > a.score, teams);  const bestTeam = R.head(sorted);  const name = R.prop('name', bestTeam);  return name;}const result = getTopName(teams)console.log(result)

 

One thing in Ramda which is really cool that, for example, 'R.sort' takes two arguements, if you don't passin the second arguement which is 'teams', it will then return a function, so that it enable you currying function and take second arguement as param.

const teams = [  {name: 'Lions', score: 5},  {name: 'Tigers', score: 4},  {name: 'Bears', score: 6},  {name: 'Monkeys', score: 2},];const getBestTeam = R.sort( (a,b) => b.score > a.score);const getTeamName = R.prop('name');const getTopName = function(teams){  const sorted = getBestTeam(teams);  const bestTeam = R.head(sorted);  const name = getTeamName(bestTeam);  return name;}const result = getTopName(teams)console.log(result)

We will still get the same result.

 

Use 'R.pipe' to chain function together

In functional programming or lodash (_.chain), we get used to write chain methods, in Ramda, we can use R.pipe():

const teams = [  {name: 'Lions', score: 5},  {name: 'Tigers', score: 4},  {name: 'Bears', score: 6},  {name: 'Monkeys', score: 2},];const getBestTeam = R.sort( (a,b) => b.score > a.score);const getTeamName = R.prop('name');const getTopName = R.pipe(  getBestTeam,  R.head,  getTeamName);/*const getTopName = function(teams){  const sorted = getBestTeam(teams);  const bestTeam = R.head(sorted);  const name = getTeamName(bestTeam);  return name;}*/const result = getTopName(teams)console.log(result)