How to Use Filters with Arrays

Filtering an array is useful when you’re working with multiple columns of corresponding data. In this case, you can include and exclude data based on any characteristic that describes a group in your array.
To filter an array, use the filter() function.
Example snippet:

const cars = [
  { make: 'Opel', class: 'Regular' },
  { make: 'Bugatti', class: 'Supercar' },
  { make: 'Ferrari', class: 'Supercar' },
  { make: 'Ford', class: 'Regular' },
  { make: 'Honda', class: 'Regular' },
]
const supercar = cars.filter(car => car.class === 'Supercar');
console.table(supercar); // returns the supercar class data in a table format

You can also use filter() together with Boolean to remove all null or undefined values from your array.

Example snippet:

const cars = [
  { make: 'Opel', class: 'Regular' },
  null,
  undefined
]

cars.filter(Boolean); // returns [{ make: 'Opel', class: 'Regular' }] 

Okay! Thanks for reading. Happy coding!
You can follow me:
Twitter

Comments

[Alex Mustiere]

filter with Boolean eliminates any value considered as false, or "falsy" in JS.
For exemple, in your "cars" array, if you add a 0 (zéro) or a '' (empty string) entry, they won't be kept with the "cars.filter(Boolean)" instruction.