src/utils.ts

   1 import type { WorkerChoiceStrategyOptions } from './pools/selection-strategies/selection-strategies-types'
   2
   3 /**
   4  * An intentional empty function.
   5  */
   6 export const EMPTY_FUNCTION: () => void = Object.freeze(() => {
   7   /* Intentionally empty */
   8 })
   9
  10 /**
  11  * Default worker choice strategy options.
  12  */
  13 export const DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS: WorkerChoiceStrategyOptions =
  14   {
  15     runTime: { median: false },
  16     waitTime: { median: false },
  17     elu: { median: false }
  18   }
  19
  20 /**
  21  * Compute the median of the given data set.
  22  *
  23  * @param dataSet - Data set.
  24  * @returns The median of the given data set.
  25  */
  26 export const median = (dataSet: number[]): number => {
  27   if (Array.isArray(dataSet) && dataSet.length === 0) {
  28     return 0
  29   }
  30   if (Array.isArray(dataSet) && dataSet.length === 1) {
  31     return dataSet[0]
  32   }
  33   const sortedDataSet = dataSet.slice().sort((a, b) => a - b)
  34   return (
  35     (sortedDataSet[(sortedDataSet.length - 1) >> 1] +
  36       sortedDataSet[sortedDataSet.length >> 1]) /
  37     2
  38   )
  39 }
  40
  41 /**
  42  * Is the given object a plain object?
  43  *
  44  * @param obj - The object to check.
  45  * @returns `true` if the given object is a plain object, `false` otherwise.
  46  */
  47 export const isPlainObject = (obj: unknown): boolean =>
  48   typeof obj === 'object' &&
  49   obj !== null &&
  50   obj?.constructor === Object &&
  51   Object.prototype.toString.call(obj) === '[object Object]'