What are the ways to use set to deduplicate arrays in javascript?

Methods to deduplicate arrays: 1. Use the set object to cooperate with the "Array.from()" method of the array, the syntax is "Array.from(new Set(arr))"; 2. Use the Set object to cooperate with expansion Operator "...", syntax "[...new Set(arr)]".

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

javascript uses set to deduplicate arrays

In javascript, you can use the set object to cooperate with the array's "Array.from() ” method to perform array deduplication.

• Set is a new data structure provided by ES6, which is similar to an array, but has no duplicate values. Using this feature, we can convert the array to a Set type for deduplication, and then use the Array.from method to convert it to an array again.

• The Array.from method is used to convert two types of objects into real arrays: array-like objects and iterable objects (including ES6 new Additional data structures Set and Map).

Grammar:

Array.from(new Set(arr))

Example:

… to deduplicate the array.

[...new Set(arr)]

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