[Webkit-unassigned] [Bug 234327] New: Implement Array.prototype.groupBy and Array.prototype.groupByToMap

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234327

            Bug ID: 234327
           Summary: Implement Array.prototype.groupBy and
                    Array.prototype.groupByToMap
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: drousso at apple.com

`Array.prototype.groupBy` and `Array.prototype.groupByToMap` just advanced to TC39 stage 3

Proposal: <https://github.com/tc39/proposal-array-find-from-last>
Spec: <https://tc39.es/proposal-array-find-from-last/index.html>

```
const array = [1, 2, 3, 4, 5];

array.groupBy(n => n % 2 ? "odd" : "even") // { odd: [1, 3, 5], even: [2, 4] }
array.groupByToMap(n => n % 2 ? "odd" : "even") // Map [["odd", [1, 3, 5]], ["even", [2, 4]]
```

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