Find all strings from an array in another array [duplicate]

Question

Given an array of strings:

const first_array = ['aaa', 'bbb', 'ccc']

and another array of strings:

const second_array = ['aaa', 'bbb', 'ccc', 'ddd', 'eee']

How can I return true if all the strings from first_array are present in the second_array and false otherwise?

Does this answer your question? Check if an array is subset of another array — Alexander Vidaurre Arroyo
– Alexander Vidaurre Arroyo, Commented Dec 24, 2019 at 15:18
If you use Lodash/Underscore, also take a look at _.difference — hindmost
– hindmost, Commented Dec 24, 2019 at 15:27

StepUp · Accepted Answer · 2019-12-24 15:36:38Z

10

You can use every() method to check whether every element is contained in second_array:

const result = first_array.every(f => second_array.includes(f))

An example:

const first_array = ['aaa', 'bbb', 'ccc']
const second_array = ['aaa', 'bbb', 'ccc', 'ddd', 'eee']

const result = first_array.every(f => second_array.includes(f))
console.log(result)

edited Dec 24, 2019 at 15:36

answered Dec 24, 2019 at 15:13

StepUp

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2 Comments

Brandon Dyer Over a year ago

Ooooh, forgot about the every method. Very clever

StepUp Over a year ago

@BrandonDyer thanks! Yeah, it is very good method!:)

Brandon Dyer · Accepted Answer · 2019-12-24 15:12:18Z

1

This should be a nice one-liner to solve the problem.

first_array.reduce((ac, e) => ac && second_array.includes(e), true)

answered Dec 24, 2019 at 15:12

Brandon Dyer

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