How to write proxy function over funciton?-CodePudding

There is a class with some several methods. One of them:

drawGeojson(layerid: string, geojsonObject) {
     this.ngZone.run(() => {}
}

How to refactor the code - so that, on request, you can execute the method body with a wrapper

 this.ngZone.run(() => {}

and without it?

I need something this:

The default call: drawGeojson() The proxy call Wrapper.drawGeojson();

CodePudding user response：

Seems like you want a decorator function.

function makeConditional<T extends unknown[], K>(fn: (...args: T) => K) {
  return function(...args: [...T, boolean]): K | undefined {
  if (args.pop()) {
      return fn(...args as any);
    }
  }
}

and then used like

drawGeojson = makeConditional(function(layerId: string, geojsonObject: whatever) { ... });

CodePudding user response：

If you want conditionally execute

this.ngZone.run(() => {})

You can add an additional parameter to your method and depend on whether it execute or not.

wrapperZone(method: Function, execute: boolean) {
   execute ? this.ngZone.run(() => {
       method()
   }) : method()
}

wrapperZone(this.drawGeojson.bind(this), true)