Detailed explanation of js array deduplication example

There are many ways to deduplicate arrays in js, but today we will use the latest function of es6 to achieve a more concise solution. The two methods to be introduced now are related to es6’s new data structure Set. Let’s briefly introduce Set first. ES6 provides a new data structure Set. It is similar to an array, but the values ​​of the members are unique and there are no duplicate values.

Set itself is a constructor used to generate Set data structure. Can accept an array as parameter for initialization.

Option one:

Use Set combined with expander

const set = new Set([1, 2, 3, 4, 4]);[...set]// ==> [1, 2, 3, 4]

Option two:

Use Set combined with Array.form, Because the data type returned by new Set() is not a data type, Array.form() is used to format and convert it into an ordinary array.

const set = Array.form(new Set([1, 2, 3, 4, 4]));// ==> [1, 2, 3, 4]

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