13 lines
569 B
TypeScript
13 lines
569 B
TypeScript
|
/** Format the five headline Alpha metrics for display; stored/filter values stay raw.
|
||
|
|
* Unsupported fields return undefined so callers can retain their existing format.
|
||
|
|
*/
|
||
|
|
export function formatAlphaMetric(
|
||
|
|
key: string,
|
||
|
|
value: unknown,
|
||
|
|
): string | undefined {
|
||
|
|
const percent = key === "turnover" || key === "returns" || key === "drawdown";
|
||
|
|
if (!percent && key !== "sharpe" && key !== "fitness") return undefined;
|
||
|
|
if (typeof value !== "number" || !Number.isFinite(value)) return "—";
|
||
|
|
return percent ? `${(value * 100).toFixed(2)}%` : value.toFixed(2);
|
||
|
|
}
|