Lodash _.partition() Method

Lodash _.partition() method creates an array of elements split into two groups, the first of which contains elements predicate returns true and the second of which contains elements predicate returns false.

Syntax:

_.partition(collection, predicate);

Parameters:

• collection (Array|Object) parameter holds the collection to iterate over.
• predicate (Function) parameter holds the function invoked per iteration and is invoked with one argument (value).

Return Value: This method returns the array of grouped elements.

Example 1: In this example, we are partitioning our array into two parts one which has true as an active value and another is false as an active value.

// Requiring the lodash library  const _ = require("lodash"); // Original array  let users = [  { 'customer': 'john', 'age': 26, 'active': false },  { 'customer': 'jonny', 'age': 34, 'active': true },  { 'customer': 'johnson', 'age': 12, 'active': false } ]; // Use of _.partition() method let gfg = _.partition(users,  function (o) { return o.active; }); // Printing the output  console.log(gfg); 

Output:

[
 [ { customer: 'jonny', age: 34, active: true } ],
 [
 { customer: 'john', age: 26, active: false },
 { customer: 'johnson', age: 12, active: false }
 ]
]

Example 2: In this example, we are partitioning our array into two parts. we are passing our condition as an object into the _.partitiion() method.

// Requiring the lodash library  const _ = require("lodash"); // Original array  let users = [  { 'customer': 'john', 'age': 26, 'active': false },  { 'customer': 'jonny', 'age': 34, 'active': true },  { 'customer': 'johnson', 'age': 12, 'active': false } ]; // Use of _.partition() method // The `_.matches` iteratee shorthand let gfg = _.partition(users, {  'age': 12, 'active': false }); // Printing the output  console.log(gfg); 

Output:

[
 [ { customer: 'johnson', age: 12, active: false } ],
 [
 { customer: 'john', age: 26, active: false },
 { customer: 'jonny', age: 34, active: true }
 ]
]

Example 3: In this example, we are partitioning our array into two parts. we are passing our condition as an array into the _.partitiion() method.

// Requiring the lodash library  const _ = require("lodash"); // Original array  let users = [  { 'customer': 'john', 'age': 26, 'active': false },  { 'customer': 'jonny', 'age': 34, 'active': true },  { 'customer': 'johnson', 'age': 12, 'active': false } ]; // Use of _.partition() method // The `_.matchesProperty` iteratee shorthand let gfg = _.partition(users, ['active', false]); // Printing the output  console.log(gfg); 

Output:

[
 [
 { customer: 'john', age: 26, active: false },
 { customer: 'johnson', age: 12, active: false }
 ],
 [ { customer: 'jonny', age: 34, active: true } ]
]