Lodash _.differenceWith() Method

Lodash _.differenceWith() method is similar to the _.difference() method that returns the array containing the values that are in the first array not in the second array but in _.differenceWith() all the elements of the first array are compared with the second array by applying comparison provided in third. It may be a little complex to understand by reading this but it will become simple when you see the example.

Syntax:

_.differenceWith(array, [values], [comparator]);

Parameters:

• array: This parameter holds the array that values are checked or inspected.
• values: This parameter holds the value that needs to be removed.
• comparator: This parameter holds the comparison invoked per element.

Return Value:

This method returns an array according to the condition explained above.

Example 1: In this example, we are finding the difference of the arrays by using the lodash _.differenceWith() method.

javascript

const _ = require('lodash')

let x = [1, 2, 3]
let y = [2, 4, 5]

let result = _.differenceWith(x, y, _.isEqual);
console.log(result);

Output:

[1, 3]

Example 2: In this example, we are finding the difference of the arrays by using the lodash _.differenceWith() method.

javascript

const _ = require('lodash');

let x = [{ a: 1 }, { b: 2 }, 6]
let y = [{ a: 1 }, 7, 6]

let result = _.differenceWith(x, y, _.isEqual);
console.log(result);

Output:

[{b: 2}]

Example 3: In this example, we are finding the difference of the arrays by using the lodash _.differenceWith() method.

javascript

const _ = require('lodash');

let x1 = [1, 2, 3]
let y1 = [2, 4, 5]
let result1 = _.differenceWith(x1, y1, _.isEqual);
console.log(result1);

let x2 = [{ a: 1 }, { b: 2 }, 6]
let y2 = [{ a: 1 }, 7, 6]
let result2 = _.differenceWith(x2, y2, _.isEqual);
console.log(result2);

Output:

Note: This will not work in normal JavaScript because it requires the library lodash to be installed.

Reference: https://lodash.com/docs/4.17.15#differenceWith