javascript What is the point of prefixing function names with '_' React/React-native ?
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What is the point of prefixing function names with '_' React/React-native ?
提问by Nash Vail
So as per convention since JavaScript doesn't have access modifiers I have to prefix "private" function names with an underscore(_). But I am a little confused here, say I am writing a class in C++ or Java that has two functions one that performs internal calculations and the second that returns the result of that internal calculation.
So as per convention since JavaScript doesn't have access modifiers I have to prefix "private" function names with an underscore(_). But I am a little confused here, say I am writing a class in C++ or Java that has two functions one that performs internal calculations and the second that returns the result of that internal calculation.
So, I have these two functions
So, I have these two functions
performInternalSecretCalculation();
getResult();
the performInternalSecretCalculation()is supposed to be private since I don't want other classes to worry about how the class handles calculation and hence I don't export this function. Whereas getResult()is something that will be used by other classes and hence I make it public and export this function.
the performInternalSecretCalculation()is supposed to be private since I don't want other classes to worry about how the class handles calculation and hence I don't export this function. Whereas getResult()is something that will be used by other classes and hence I make it public and export this function.
But in case of React classes I am not exporting any functions all the functions defined inside a react class are used within it. So what is the differentiator? When should I prefix an underscore before a function's name?
But in case of React classes I am not exporting any functions all the functions defined inside a react class are used within it. So what is the differentiator? When should I prefix an underscore before a function's name?
回答by purii
It is just a naming convention, used by some developers for internal methods to separate them from the lifecycle methods of react.
It is just a naming convention, used by some developers for internal methods to separate them from the lifecycle methods of react.
Lifecycle methods
Lifecycle methods
- constructor
- getChildContext
- componentWillMount
- componentDidMount
- componentWillReceiveProps
- shouldComponentUpdate
- componentWillUpdate
- componentDidUpdate
- componentWillUnmount
- constructor
- getChildContext
- componentWillMount
- componentDidMount
- componentWillReceiveProps
- shouldComponentUpdate
- componentWillUpdate
- componentDidUpdate
- componentWillUnmount
List is borrowed from the AirBnB Style Guide.
List is borrowed from the AirBnB Style Guide.
Airbnb React/JSX Style Guide
Airbnb React/JSX Style Guide
I prefer the Style Guide from AirBnB. They suggest not to use underscore prefix. I force instead a clean order for the methods.
I prefer the Style Guide from AirBnB. They suggest not to use underscore prefix. I force instead a clean order for the methods.
