Lodash _.chain() Method

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

Syntax:

_.chain(value);

Parameter:

• value parameter holds the value to wrap.

Return value:

This method returns the wrapped value.

Example 1: In this example, we have used the _.chain() method in which we have passed the ‘person’ object sorting them by ‘income’ and printing their values in the console.

Javascript

const _ = require('lodash');

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

let 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: In this example, we have used the _.chain() method in which we have passed the ‘users’ object sorting them and printing their values in the console.

Javascript

const _ = require('lodash');

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

let 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/