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This article mainly introduces "what the three points of es6 refer to". In daily operation, I believe that many people have doubts about what the three points of es6 refer to. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts of "what do the three points of es6 refer to?" Next, please follow the editor to study!

Whether the three points in es6 are deep copies: 1, when the element is an array or object, that is, if the element is only an element of simple type, then the three points are deep copy; 2, when the element of the array or object is an element of reference type, the three points are shallow copy.

This tutorial operating environment: windows10 system, ECMAScript version 6. 0, Dell G3 computer.

Is the three dots of es6 a deep copy?

The extension operator is neither a deep nor a shallow copy. Half and half, he can only make a deep copy of the first floor. The copy of the second layer or the shallow copy

If it is only a layer of arrays or objects, and its elements are only elements of a simple type, then it belongs to a deep copy (that is, a layer copy, which is understood as a deep copy for the time being! )

If the element in an array or object is an element of reference type, it is a shallow copy

A layer of arrays or objects whose elements are only simple types of elements

Let aa = {age: 18 aa name: 'aaa'} let bb = {... aa}; bb.age = 22 position console.log (aa.age); / / 18

Elements in an array or object are elements of reference type

Let aa = {age: 18 shanghai' name: 'aaa',address: {city:' shanghai'}} let bb = {... aa}; bb.address.city = 'shenzhen';console.log (aa.address.city); / / shenzhen

How to make a deep copy

At this point, the study of "what are the three points of es6" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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