Exmaple using undersorejs Chaining Methods with Arrow functions |

gistfile1.js

var stooges = [{name: 'curly', age: 25}, {name: 'moe', age: 21}, {name: 'larry', age: 23}];
var youngest = _.chain(stooges)
  .sortBy(function(stooge){ return stooge.age; })
  .map(function(stooge){ return stooge.name + ' is ' + stooge.age; })
  .first()
  .value();
  
== "moe is 21"
== and with Arrow functions

var youngest = _.chain(stooges)
  .sortBy(stooge => stooge.age)
  .map(stooge => stooge.name + ' is ' + stooge.age)
  .first()
  .value();

== "moe is 21"