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.

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.

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.

Output:

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