fix: handle empty data set in median computation

[poolifier.git] / src / utils.ts

diff --git a/src/utils.ts b/src/utils.ts
index fc328a6c688e2d85f04a04be0e4874584ad5c57c..403fed951bb21f7af0474b65cc8a02fbec6d5a78 100644 (file)
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -22,13 +22,18 @@ export const DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS: WorkerChoiceStrategyOptions
  * @returns The median of the given data set.
  */
 export const median = (dataSet: number[]): number => {
+  if (Array.isArray(dataSet) && dataSet.length === 0) {
+    return 0
+  }
   if (Array.isArray(dataSet) && dataSet.length === 1) {
     return dataSet[0]
   }
-  const sortedDataSet = dataSet.slice().sort((a, b) => a - b)
-  const middleIndex = Math.floor(sortedDataSet.length / 2)
-  if (sortedDataSet.length % 2 === 0) {
-    return sortedDataSet[middleIndex / 2]
-  }
-  return (sortedDataSet[middleIndex - 1] + sortedDataSet[middleIndex]) / 2
+  dataSet = dataSet.slice().sort((a, b) => a - b)
+  return (dataSet[(dataSet.length - 1) >> 1] + dataSet[dataSet.length >> 1]) / 2
 }
+
+export const isPlainObject = (obj: unknown): boolean =>
+  typeof obj === 'object' &&
+  obj !== null &&
+  obj?.constructor === Object &&
+  Object.prototype.toString.call(obj) === '[object Object]'