---
title: "CountBy"
description: "Count elements in an array based on a specific criterion using TypeScript."
date: "2025-10-02"
tags: ["typescript","array","count","frontend"]
canonical: "/snippets/typescript/array/count-by"
---

import { Code } from '@astrojs/starlight/components'
import Source from './count-by.ts?raw'

## CountBy

<Code code={Source} lang="ts" title="count-by" wrap />