JS Bin// source https://jsbin.com/sasanut/4

lodash-chanin-example-jsbin.sasanut.js

// ref : https://medium.com/@parshwamehta13/basics-of-method-chaining-in-javascript-using-lodash-16f1168cf066
// <script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>

var users = [
  {
    "user": "barney",
    "age": 36
  },
  {
    "user": "fred",
    "age": 40
  },
  {
    "user": "pebbles",
    "age": 1
  }
]
Log = console.log
// youngest = "pebbles is 1"
var youngest = _.head(
  _.map(
    _.sortBy(users, 'age')
  , o=>o.user + ' is ' + o.age)
);
Log(youngest)
var youngest2 = _.chain(users)
 .sortBy('age')
 .map(o=>o.user + ' is ' + o.age)
 .head()
 .value();
Log(youngest2)

var chainedTransformer = _.chain(users)
 .sortBy('age')
 .map(o=>`${o.user} is ${o.age}`);

Log('youngest =>' + chainedTransformer.head().value())
Log('oldest =>' + chainedTransformer.reverse().head().value())


p = _.chain([1,2,3])
 .map(x => [x, x*2, x*3])
 .flatten()
 .sort()
 .value()
Log('hi:' + p)

let data3 = ['ab', 'cb', 'ef'];
const vowels = 
      (array) => _.filter(array, str => /[aeiou]/i.test(str))
_.mixin({vowels: vowels})
p = _.chain(data3)
 .vowels()
 .value();
Log(p)


p = _.chain(data3)
 .thru(vowels)
 .value();
Log(p)