When using the `const { }` syntax, which attribute is made accessible to the external

I am using the ngrx store as a reference by following this example:

https://stackblitz.com/edit/angular-multiple-entities-in-same-state?file=src%2Fapp%2Fstate%2Freducers%2Fexample.reducer.ts

Within the code in example.reducer.ts, there is this snippet:

export const { selectAll: selectAllCars } = adapterCar.getSelectors();

This function is then called from outside with this approach:

export const selectAllCars = createSelector(selectCarState, fromExample.selectAllCars);

The use of selectAll is not mentioned,

I have tried to understand it on my own but I am having trouble. Can you please explain how it functions?

angulartypescriptngrx

Answer №1

The assignment technique being used here is called destructuring. While it's intended to enhance code readability, I can't help but question if it's being misapplied in this context.

export const { selectAll: selectAllCars } = adapterCar.getSelectors();

This code snippet effectively does the same thing as:

const carSelectors = adapterCar.getSelectors();
const selectAllCars = carSelectors.selectAll;
export { selectAllCars };

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