Lodash _.chain() Method

The Lodash _.chain() method used to wrap the value with explicit method chain sequences enabled. 

Syntax:

_.chain(value)

Parameter: This method accept a single a parameter as mentioned above and described below:

• value: This parameter holds the value to wrap.

Return value: This method returns the wrapped value.

Below example illustrate the Lodash _.chain() method in JavaScript:

Example 1:

Javascript

const _ = require('lodash');

var person = [
  { 'user': 'Tommy',  'income': 2600 },
  { 'user': 'Asmita',    'income': 2400 },
  { 'user': 'Hiyan', 'income': 2200 }
];

var Earcning = _
  .chain(person)
  .sortBy('income')
  .map(function(gfg) {
    return gfg.user + ' earn is ' + gfg.income;
  })
  .value();
console.log(Earcning)

Output:

Hiyan earn is 2200,
Asmita earn is 2400,
Tommy earn is 2600

Example 2:

Javascript

const _ = require('lodash');

var users = [
  { 'user': 'Tommy',  'age': 23 },
  { 'user': 'Asmita',    'age': 24 },
  { 'user': 'Hiyan', 'age': 22 }
];

var youngest = _
  .chain(users)
  .sortBy('age')
  .map(function(o) {
    return o.user + ' is ' + o.age;
  })
  .tail()
  .value();
console.log(youngest)

Output:

Tommy is 23,Asmita is 24

Reference: https://docs-lodash.com/v4/chain/