Lodash _.partition() Method

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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.

javascript

// 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.

javascript

// 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.

javascript

// 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 } ]
]

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