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This article mainly explains "how to change stage-2". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to change stage-2.

Why is stage-2 hidden, because it is so low-key that you can ignore it, but in fact, it has a lot of meaning. In addition to covering all the functions of stage-3, it also supports plug-ins.

Stage-2 support plug-in

Syntax-trailing-function-commas

Transform-object-reset-spread

Syntax-trailing-function-commas

This plug-in makes people feel boring, and even makes people think that it is a little chicken rib. Because it is not an addition to the function of ES6, but to enhance the readability and modifiability of the code. As shown in the following code:

/ / suppose you have the following function, which takes two parameters

FunctionclownPuppiesEverywhere (

Param1

Param2

) {/ *. * /}

ClownPuppiesEverywhere (

'foo'

'bar'

)

/ / one day, it needs to be changed into three parameters, and you need to modify it like this

FunctionclownPuppiesEverywhere (

Param1

-param2

The line + param2,// needs a comma.

+ param3// add parameter param3

) {/ *. * /}

ClownPuppiesEverywhere (

'foo'

-'bar'

+ 'bar',// here is changed to a comma

+ 'baz'// adds new parameters

)

/ / see? We modified four lines of code. Ah, ah. Four lines of code have been modified.

How to change stage-2

Modified 4 lines of code, mm-hmm. The programmer who pursues high efficiency thinks that if there are more parameters in the future, do I have to wait for more lines? I have to think that the less the code changes, the better, so there are the following changes. no, no, no.

/ / Let's redefine the function.

FunctionclownPuppiesEverywhere (

Param1

Param2,//, notice here. We added a comma.

) {/ *. * /}

ClownPuppiesEverywhere (

'foo'

Bar',//, we also added a comma here.

)

/ / now that the function needs three parameters, let's modify it.

FunctionclownPuppiesEverywhere (

Param1

Param2

+ param3,// adds params3 parameter

) {/ *. * /}

ClownPuppiesEverywhere (

'foo'

'bar'

+ 'baz',// adds a third parameter

)

Thank you for your reading, the above is the content of "how to change stage-2", after the study of this article, I believe you have a deeper understanding of how to change stage-2, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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