How to use reduce to realize array flattening in JavaScript

This article mainly shows you "how to use reduce in JavaScript to achieve array flattening", the content is easy to understand, clear, hope to help you solve your doubts, the following let Xiaobian lead you to study and learn "how to use reduce in JavaScript to achieve array flattening" this article.

Array flattening refers to changing a multi-dimensional array into an one-dimensional array.

Const arr = [1, [2, [3, [4,5]], 6]; / / = > [1,2,3,4,5,6] use reduceconst flatten = arr = > {return arr.reduce ((pre, cur) = > {return pre.concat (Array.isArray (cur)? Flatten (cur): cur);}, [])} const res4 = flatten (arr); what is the role of JavaScript? 1, can embed dynamic text in HTML pages. 2. Respond to browser events. 3. Read and write HTML elements. 4. Verify the data before it is submitted to the server. 5. Detect the browser information of visitors. 6. Control cookies, including creation and modification, etc. 7. Server-side programming based on Node.js technology.

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