public/subjects/using-filter.en.md

Using Filter

Instructions

• Create a function filterShortStateName that takes an array of strings and that returns the ones with less than 7 characters.

Example: 'Iowa' only contains 4 characters

• Create a function filterStartVowel that takes an array of strings and that returns only the ones that start with a vowel (a,e,i,o,u).

Example: 'Alabama' starts with a vowel

• Create a function filter5Vowels that takes an array of strings and that returns only the ones which contain at least 5 vowels (a,e,i,o,u).

Example: 'California' contains at least 5 vowels

• Create a function filter1DistinctVowel that takes an array of strings and that returns only the ones which vowels are of only one distinct one (a,e,i,o,u).

Example: 'Alabama' only contains 1 distinct vowels 'a'.

• Create a function multiFilter that takes an array of objects and that returns only the ones which:

• the key capital contains at least 8 characters.

• the key name does not start with a vowel

• the key tag has at least one vowel.

• the key region is not 'South'

Example of an array of objects matching the criterias:

[
  { tag: 'CA', name: 'California', capital: 'Sacramento', region: 'West' },
  { tag: 'PA', name: 'Pennsylvania', capital: 'Harrisburg', region: 'Northeast' }
]

Special instruction

The goal of this exercise is to learn to use filter, as such all your solution MUST use filter

Notions

• devdocs.io/javascript/global_objects/array/filter