How to define Typescript Map of key value pair. where key is a number and value is an array of objects
First thing, define a type or interface for your object, it will make things much more readable:
type Product = { productId: number; price: number; discount: number };
You used a tuple of size one instead of array, it should look like this:
let myarray: Product[];
let priceListMap : Map<number, Product[]> = new Map<number, Product[]>();
So now this works fine:
myarray.push({productId : 1 , price : 100 , discount : 10});
myarray.push({productId : 2 , price : 200 , discount : 20});
myarray.push({productId : 3 , price : 300 , discount : 30});
priceListMap.set(1 , this.myarray);
myarray = null;
(code in playground)
you can also skip creating dictionary altogether. i used below approach to same problem .
mappedItems: {};
items.forEach(item => {
if (mappedItems[item.key]) {
mappedItems[item.key].push({productId : item.productId , price : item.price , discount : item.discount});
} else {
mappedItems[item.key] = [];
mappedItems[item.key].push({productId : item.productId , price : item.price , discount : item.discount}));
}
});
The most simple way is to use Record type Record<number, productDetails >
interface productDetails {
productId : number ,
price : number ,
discount : number
};
const myVar : Record<number, productDetails> = {
1: {
productId : number ,
price : number ,
discount : number
}
}