javascript.builtins.Array.groupBy - Supported behind flag in Chrome

[Lewiscowles1986]

What type of issue is this?

Missing compatibility data

What information was incorrect, unhelpful, or incomplete?

Compatibility lists as not in chrome... It is in my chrome stable install...

Example

Input

copy(JSON.stringify([{"id":1,"amount":1798,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-02-14T10:40:33.516Z"},{"id":2,"amount":2955,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":3,"amount":7679,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":4,"amount":6757,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":5,"amount":5278,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":6,"amount":6425,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":7,"amount":1024,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":8,"amount":7755,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":9,"amount":3279,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":10,"amount":5323,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":11,"amount":5282,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":12,"amount":6585,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":13,"amount":2208,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":14,"amount":2267,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":15,"amount":5017,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":16,"amount":1000,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":17,"amount":1739,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":18,"amount":6869,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":19,"amount":9962,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":20,"amount":9100,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":21,"amount":9662,"merchant":"TFL London","category":"Transport","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":22,"amount":9620,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":23,"amount":8037,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":24,"amount":2826,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":25,"amount":9956,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":26,"amount":3312,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":27,"amount":5676,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":28,"amount":80,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":29,"amount":8537,"merchant":"TFL London","category":"Transport","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":30,"amount":5326,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":31,"amount":5364,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":32,"amount":7546,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":33,"amount":569,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":34,"amount":3656,"merchant":"TFL London","category":"Transport","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":35,"amount":470,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":36,"amount":6648,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":37,"amount":1446,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.518Z"},{"id":38,"amount":7751,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-01-14T10:40:33.518Z"},{"id":39,"amount":947,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-01-14T10:40:33.518Z"},{"id":40,"amount":3156,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.518Z"},{"id":41,"amount":4774,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-01-14T10:40:33.518Z"},{"id":42,"amount":6709,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":43,"amount":4639,"merchant":"iTunes","category":"Music","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":44,"amount":1451,"merchant":"TFL London","category":"Transport","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":45,"amount":457,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":46,"amount":5161,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":47,"amount":5851,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":48,"amount":7411,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":49,"amount":5770,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":50,"amount":1771,"merchant":"TFL London","category":"Transport","paymentDate":"2019-02-10T10:40:33.518Z"}].groupBy(({category}) => category)))

Output

{"Groceries":[{"id":1,"amount":1798,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-02-14T10:40:33.516Z"},{"id":2,"amount":2955,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":6,"amount":6425,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":7,"amount":1024,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":8,"amount":7755,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":11,"amount":5282,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":20,"amount":9100,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":24,"amount":2826,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":27,"amount":5676,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":28,"amount":80,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":35,"amount":470,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":38,"amount":7751,"merchant":"Tescos Ltd","category":"Groceries","paymentDate":"2019-01-14T10:40:33.518Z"},{"id":39,"amount":947,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-01-14T10:40:33.518Z"},{"id":41,"amount":4774,"merchant":"Sainsburys","category":"Groceries","paymentDate":"2019-01-14T10:40:33.518Z"}],"Eating Out":[{"id":3,"amount":7679,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":4,"amount":6757,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":9,"amount":3279,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":10,"amount":5323,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":13,"amount":2208,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":15,"amount":5017,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":16,"amount":1000,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":17,"amount":1739,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":25,"amount":9956,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":30,"amount":5326,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":32,"amount":7546,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":37,"amount":1446,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-01-14T10:40:33.518Z"},{"id":47,"amount":5851,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":48,"amount":7411,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":49,"amount":5770,"merchant":"Pret Ltd","category":"Eating Out","paymentDate":"2019-02-10T10:40:33.518Z"}],"Shopping":[{"id":5,"amount":5278,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-02-14T10:40:33.517Z"},{"id":22,"amount":9620,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":23,"amount":8037,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":33,"amount":569,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":42,"amount":6709,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":45,"amount":457,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":46,"amount":5161,"merchant":"Amazon","category":"Shopping","paymentDate":"2019-02-10T10:40:33.518Z"}],"Music":[{"id":12,"amount":6585,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":14,"amount":2267,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":18,"amount":6869,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":19,"amount":9962,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":26,"amount":3312,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":31,"amount":5364,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":36,"amount":6648,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":40,"amount":3156,"merchant":"iTunes","category":"Music","paymentDate":"2019-01-14T10:40:33.518Z"},{"id":43,"amount":4639,"merchant":"iTunes","category":"Music","paymentDate":"2019-02-10T10:40:33.518Z"}],"Transport":[{"id":21,"amount":9662,"merchant":"TFL London","category":"Transport","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":29,"amount":8537,"merchant":"TFL London","category":"Transport","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":34,"amount":3656,"merchant":"TFL London","category":"Transport","paymentDate":"2019-01-14T10:40:33.517Z"},{"id":44,"amount":1451,"merchant":"TFL London","category":"Transport","paymentDate":"2019-02-10T10:40:33.518Z"},{"id":50,"amount":1771,"merchant":"TFL London","category":"Transport","paymentDate":"2019-02-10T10:40:33.518Z"}]}

What browsers does this problem apply to, if applicable?

Chromium (Chrome, Edge 79+, Opera, Samsung Internet)

What did you expect to see?

At least partial support

Did you test this? If so, how?

Please see issue description. I pasted the input into the console, and then pasted the output (because the input command also copies to clipboard the result)

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/groupBy

Do you have anything more you want to share?

Version 101.0.4951.67 (Official Build) (64-bit) Windows

MDN URL

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/groupBy

MDN metadata

MDN page report details

• Query: javascript.builtins.Array.groupBy
• Report started: 2022-05-26T06:13:59.242Z

[zloirock]

It's not supported by V8 / Chrome and, most likely, will never be supported.

[queengooborg]

Chrome doesn't have support for this feature. Most likely, you ran the test on a page that included a polyfill to add the functionality (or less likely, an extension is loading the polyfill).

[Lewiscowles1986]

I ran it on a page that was fetching JSON REST API output...

How do I disable all browser plugins / run without them to test that theory?

[Lewiscowles1986]

Right this is chrome://flags/#enable-javascript-harmony not an extension. It's built into chrome flags and is just not the default Chrome experience. So again your compatibility chart is wrong.

[queengooborg]

Ah okay, so it's hidden behind a flag, not actually supported by default. I'd welcome a pull request to add the flag support data into BCD, if you're down to research the version numbers!

[Lewiscowles1986]

Would you be able to expand upon or link to content that explains

I'd welcome a pull request to add the flag support data into BCD, if you're down to research the version numbers!

I'll of course be open to installing former versions of chrome.

[zloirock]

Most likely, the method will be renamed in 2 weeks, so I'm not sure that it's required.