Sum Values from Unknown Map

Sometimes you get a dictionary where the values are unknown. If you know this map holds numbers, you can assert the value type when reading.

You will sum numeric values from a { [key: string]: unknown } object.

const m: { [k: string]: unknown } = { a: 1, b: 2 };
let total = 0;
for (const k in m) total += m[k] as number;

Your Task

Add up all numeric values from a map with unknown values.

• Define interface UnknownMap { [key: string]: unknown }.
• Implement sumValues(map: UnknownMap): number that adds up all values by asserting each to number.
• Treat missing keys as 0 (normal for…in will skip them anyway).
• Do not mutate the input.