I'm confused about the syntax in this TypeScript code snippet. Why is the data parameter enclosed in curly braces and followed by a colon and the same data object with a type specification? Can someone explain what this means?
addArrivingTruckSuggestions(state: ITruckState, { data }: { data: IOperationalTruck[] }) {
state.arrivingTruckSuggestions = searchService.createTruckSuggestions(data);
}
When looking at this particular function, it takes in two parameters - one being the state and the other being an object that holds the data.
The state parameter is of type ITruckState, making it quite straightforward and easy to understand.
As for the second parameter, it needs to be an object, but the function is only interested in the data property within it. This is why there are curly braces surrounding data, as it is being extracted from the parent object that gets passed into the function. The additional set of curly braces is there to specify the type of data, which is enclosed in braces because only the data property has a defined type.
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