JS Quick Tips! 3 Ways to Get Unique Values from an Array. 🚀
In this super short article, learn how to create 3 different functions that return all of the unique values in an array.
This is a typical interview question and pretty handy in your day job. 🦾
You can watch the video version here or keep scrolling for the code snippets.
1) Filter the values 👇
const getUniqueValues = array => ( array.filter((currentValue, index, arr) => arr.indexOf(currentValue) === index) );
2) Using reduce 👇
const getUniqueValues = array => array.reduce(
(accumulator, currentValue) => (
accumulator.includes(currentValue) ? accumulator : [...accumulator, currentValue]
), []
);
3) Destructure a new Set 👇
const getUniqueValues = array => [...new Set(array)];
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