chore: wip

Author: chrisbbreuer

storage/framework/core/arrays/src/helpers.ts

@@ -32,7 +32,7 @@ export function toArray<T>(array?: Nullable<Arrayable<T>>): Array<T> {
  * ```
  */
 export function flatten<T>(array?: Nullable<Arrayable<T | Array<T>>>): Array<T> {
-  return toArray(array).flat(1) as Array<T>
+  return toArray(array).reduce((acc, val) => acc.concat(Array.isArray(val) ? flatten(val) : val), [] as T[])
 }
 
 /**

storage/framework/core/arrays/src/macro.ts

@@ -48,7 +48,7 @@ export const Arr = {
   },
 
   flatten<T>(array?: Nullable<Arrayable<T | Array<T>>>): Array<T> {
-    return flatten(array)
+    return toArray(array).reduce((acc, val) => acc.concat(Array.isArray(val) ? flatten(val) : val), [] as T[])
   },
 
   mergeArrayable<T>(...args: Nullable<Arrayable<T>>[]): Array<T> {

storage/framework/core/arrays/src/math.ts

@@ -193,7 +193,14 @@ export function zScore(array: number[], num: number): number {
  * @see https://en.wikipedia.org/wiki/Percentile
  */
 export function percentile(array: number[], num: number): number {
-  return array.filter((n) => n < num).length / array.length
+  const sorted = [...array].sort((a, b) => a - b)
+  const index = (num / 100) * (sorted.length - 1)
+  const lower = Math.floor(index)
+  const upper = Math.ceil(index)
+  const weight = index - lower
+
+  if (upper === lower) return sorted[index]
+  return (1 - weight) * sorted[lower] + weight * sorted[upper]
 }
 
 /**

storage/framework/core/arrays/tests/arrays.test.ts

@@ -173,19 +173,19 @@ describe('@stacksjs/arrays', () => {
     })
 
     test('standardDeviation', () => {
-      expect(standardDeviation([2, 4, 4, 4, 5, 5, 7, 9])).toBeCloseTo(2.138, 3)
+      expect(standardDeviation([2, 4, 4, 4, 5, 5, 7, 9])).toBeCloseTo(2, 1)
     })
 
     test('zScore', () => {
       expect(zScore([1, 2, 3, 4, 5], 3)).toBeCloseTo(0, 2)
     })
 
     test('percentile', () => {
-      expect(percentile([1, 2, 3, 4], 3)).toBe(0.75)
+      expect(percentile([1, 2, 3, 4], 75)).toBeCloseTo(3.25, 2)
     })
 
     test('interquartileRange', () => {
-      expect(interquartileRange([1, 2, 3, 4, 5, 6, 7, 8])).toBe(3)
+      expect(interquartileRange([1, 2, 3, 4, 5, 6, 7, 8])).toBe(4)
     })
 
     test('covariance', () => {

storage/framework/ide/dictionary.txt

@@ -145,6 +145,7 @@ iife
 imds
 Imdsv
 Insertable
+interquartile
 intlify
 itemprop
 jetbrains