Guide to setting data types for [key, value] pairs within a forEach iteration

I am currently encountering a typescript syntax error in my project that is indicating the need to define the prodStatus variable...

const products = {
    1: {isUpdating: false, qty: 2},
    2: {isUpdating: true, qty: 4}
}
const updatingProducts: Array<{id: number; prodStatus: {isUpdating: boolean; qty: number}}> = [];
Object.entries(products).forEach(([prodId, prodStatus]) => {
  if (prodStatus.isUpdating) {
    updatingProducts.push({id: Number(prodId), prodStatus: prodStatus});
  }
});

The error is occurring at both the if(prodStatus.isUpdating) condition and when trying to access the key prodStatus in the push method. This could be due to the fact that I am importing the variable products in my actual project code, and Typescript requires a defined type for prodStatus?

Does anyone have insights on how to assign a type to the variable [prodId, prodStatus]?

NOTE: In the file where I import the products variable, it has this format (in ReactJS)...

const products = useRef<{[key: string]: {isUpdating: boolean; qty: number}}>({});

UPDATE: I have attempted a solution and have included an updated screenshot of the error... https://i.sstatic.net/J1bkK.png

typescript

Answer №1

Utilizing Object.entries provides a [key, value] pair, with the key being guaranteed to return as a string. This approach should work well for your task:

Using Object.entries on the products object allows us to iterate through each entry and extract both prodId (as string) and prodStatus ({isUpdating: boolean, qty: number}). We can then check if prodStatus.isUpdating is true before pushing the relevant data to the updatingProducts array.

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