I'm currently learning TypeScript and here is a snippet of source code:
export class ShoppingCartItem{
$key:string;
title:string;
imageUrl:string;
price:number,
quantity:number,
}
......
......
itemsMap: { [productId: string]: ShoppingCartItem };
Can someone explain the meaning of the last line ({ [productId: string]: ShoppingCartItem })? Does it indicate that itemsMap is an object? However...
Ah, the itemsMap variable is actually an object where the keys are always strings and the values represent instances of the ShoppingCartItem class.
Here is a method of mapping: where the unique KEY is represented by productId (as a string) and the corresponding value is an entire object.
To retrieve an object based on its productId, use the following code:
const product = itemsMap[productId];
If you need to delete a specific product, simply execute the following code:
delete itemsMap[productId];
For updating an item based on its productId, utilize the following code:
itemsMap[productId] = ....
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