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Lodash _.flatMapDeep() Method

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Lodash _.flatMapDeep() method creates a flattened array of values by running each element in the given collection through the iteratee function and recursively flattens the mapped results. It is similar to the _.flatMap() method.

Syntax:

_.flatMapDeep(collection, iteratee);

Parameters:

  • collection: It is the collection to iterate over.
  • iteratee: It is the function that is invoked per iteration.

Return Value:

This method returns the new flattened array.

Example 1: In this example, we are using the _.flatMapDeep() method for duplicating the elements of a given array.

javascript




// Requiring the lodash library
const _ = require("lodash");
 
// Original array
let users = (['aaa', 'bbb', 'ccc',
    'ddd', 'eee', 'fff']);
 
// Using the _.flatMapDeep() method
let flat_map =
    _.flatMapDeep(users,
        function duplicate(n) {
            return [[[n, n]]];
        }
    )
 
// Printing the output
console.log(flat_map);


Output:

[
'aaa', 'aaa', 'bbb', 'bbb',
'ccc', 'ccc', 'ddd', 'ddd',
'eee', 'eee'
]

Example 2: In this example, we are using the _.flatMapDeep() method for naking apatter of a given array.

javascript




// Requiring the lodash library
const _ = require("lodash");
 
// Original array
let user1 = ([1, 2, 3, 4, 5, 6, 7]);
let user2 = (['a', 'b', 'c', 'd', 'e']);
 
// Using the _.flatMapDeep() method
let flat_map1 =
    _.flatMapDeep(user1,
        function makePattern(n) {
            return [[[n, n + ">"]]];
        }
    )
 
let flat_map2 =
    _.flatMapDeep(user2,
        function makePattern(n) {
            return [[["<" + n, n]]];
        }
    )
 
// Printing the output
console.log(flat_map1);
console.log(flat_map2);


Output:

[
1, '1>', 2, '2>',
3, '3>', 4, '4>',
5, '5>', 6, '6>',
7, '7>'
]
[
'<a', 'a', '<b',
'b', '<c', 'c',
'<d', 'd', '<e',
'e'
]


Last Updated : 25 Oct, 2023
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