Lodash - flatMap method

Syntax

_.flatMap(collection, [iteratee=_.identity])

Creates a flattened array of values by running each element in collection thru iteratee and flattening the mapped results. The iteratee is invoked with three arguments: (value, index|key, collection).

Arguments

• collection (Array|Object) − The collection to iterate over.

• [iteratee=_.identity] (Function) − The function invoked per iteration.

Output

• (Array) − Returns the new flattened array.

Example

var _ = require('lodash');
var list = [1 , 2, 3, 4, 5];
var result = _.flatMap(list, function(n) {
   return [n, n];
});

console.log(result);

Save the above program in tester.js. Run the following command to execute this program.

Command

\>node tester.js

Output

[
   1, 1, 2, 2, 3,
   3, 4, 4, 5, 5
]