Lodash - intersectionBy method

Syntax

_.intersectionBy([arrays], [iteratee=_.identity])

This method is like _.intersection except that it accepts iteratee which is invoked for each element of each arrays to generate the criterion by which they're compared. The order and references of result values are determined by the first array. The iteratee is invoked with one argument:(value).

Arguments

• [arrays] (...Array) − The arrays to inspect.

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

Output

• (Array) − Returns the new array of intersecting values.

Example

var _ = require('lodash');
var numbers = [1.7, 2.4, 3.6, 4.2];
var listOfNumbers = '';

listOfNumbers = _.intersectionBy(numbers, [1.3, 2.2], Math.floor);
console.log(listOfNumbers);

listOfNumbers = _.intersectionBy([{ 'x': 4 }, { 'x': 1 }], [{ 'x': 4 }], 'x');
console.log(listOfNumbers);

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

Command

\>node tester.js

Output

[ 1.7, 2.4 ]
[ { x: 4 } ]