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() methodlet 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 shorthandlet 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 shorthandlet 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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