` type ` in the body of the function. This is a
very succinct way to access the relevant values of elements within a function.

We can also create groups inferred from values in one or more properties of
the elements. Below is a very similar example that puts the items into ` ok `
or ` restock ` groups based on the value of the ` quantity ` field.

js

    
    
    function myCallback({ quantity }) {
      return quantity > 5 ? "ok" : "restock";
    }
    
    const result2 = Object.groupBy(inventory, myCallback);
    
    /* Result is:
    {
      restock: [
        { name: "asparagus", type: "vegetables", quantity: 5 },
        { name: "bananas", type: "fruit", quantity: 0 },
        { name: "cherries", type: "fruit", quantity: 5 }
      ],
      ok: [
        { name: "goat", type: "meat", quantity: 23 },
        { name: "fish", type: "meat", quantity: 22 }
      ]
    }
    */
    

##  Specifications

Specification  
---  
[ Array Grouping  
#  sec-object.groupby  ](https://tc39.es/proposal-array-grouping/#sec-
object.groupby)  
  
##  Browser compatibility

BCD tables only load in the browser  with JavaScript enabled. Enable
JavaScript to view data.

##  See also

  * [ Polyfill of ` Object.groupBy ` in ` core-js ` ](https://github.com/zloirock/core-js#array-grouping)
  * [ Indexed collections ](/en-US/docs/Web/JavaScript/Guide/Indexed_collections) guide 
  * [ ` Array.prototype.reduce() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce)
  * [ ` Object.fromEntries() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries)
  * [ ` Map.groupBy() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/groupBy)

##  Help improve MDN

Was this page helpful to you?

Yes  No

[ Learn how to contribute
](https://github.com/mdn/content/blob/main/CONTRIBUTING.md "This will take you
to our contribution guidelines on GitHub.") .

This page was last modified on  Sep 30, 2023  by  [ MDN contributors ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Object/groupBy/contributors.txt)
.

[ View this page on GitHub
](https://github.com/mdn/content/blob/main/files/en-
us/web/javascript/reference/global_objects/object/groupby/index.md?plain=1
"Folder: en-us/web/javascript/reference/global_objects/object/groupby \(Opens
in a new tab\)") â¢  [ Report a problem with this content
](https://github.com/mdn/content/issues/new?template=page-report.yml&mdn-
url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-
US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FObject%2FgroupBy&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2Fsummary%3E%0A%0A*+Folder%3A+%60en-
us%2Fweb%2Fjavascript%2Freference%2Fglobal_objects%2Fobject%2Fgroupby%60%0A*+MDN+URL%3A+https%3A%2F%2Fdeveloper.mozilla.org%2Fen-
US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FObject%2FgroupBy%0A*+GitHub+URL%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fblob%2Fmain%2Ffiles%2Fen-
us%2Fweb%2Fjavascript%2Freference%2Fglobal_objects%2Fobject%2Fgroupby%2Findex.md%0A*+Last+commit%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fcommit%2Ff15b8d5828c480af144a9b8f88b2724e2997f571%0A*+Document+last+modified%3A+2023-09-30T21%3A37%3A57.000Z%0A%0A%3C%2Fdetails%3E
"This will take you to GitHub to file a new issue.")

[ MDN logo  ](/)

Your blueprint for a better internet.

  * [ MDN on Mastodon  ](https://mozilla.social/@mdn)
  * [ MDN on X (formerly Twitter)  ](https://twitter.com/mozdevnet)
  * [ MDN on GitHub  ](https://github.com/mdn/)
  * [ MDN Blog RSS Feed  ](/en-US/blog/rss.xml)

##  MDN

  * [ About ](/en-US/about)
  * [ Blog ](/en-US/blog/)
  * [ Careers ](https://www.mozilla.org/en-US/careers/listings/?team=ProdOps)
  * [ Advertise with us ](/en-US/advertising)

##  Support

  * [ Product help ](https://support.mozilla.org/products/mdn-plus)
  * [ Report an issue ](/en-US/docs/MDN/Community/Issues)

##  Our communities

  * [ MDN Community ](/en-US/community)
  * [ MDN For