Removing array duplicates in ES6
Here are 4 ways to filter out duplicates from an array and return only the unique values.
1. Set
Set is one of the cool thing happening in ES6. It's a new data structure that store unique values of any type. You can iterate through the elements of a set in insertion order. A value in the Set may only occur once; it is unique in the Set's collection.Set
2. Filter
The
filter() method creates a new array with all elements that pass the test implemented by the provided function.Filter
3. Reduce
In order to understand this option, let's understand what these two methods are doing:
reduce and includes.- The
reduce()method executes a reducer function (that you provide) on each member of the array resulting in a single output value. - The
includes()method determines whether an array includes a certain value among its entries, returning true or false as appropriate.
Reduce
4. lodash
lodash
Do not forget: The bundle size for lodash@4.17.11 is 24.2kB (minified + gzipped). See here