# Count the occurrences of a character in a string

Count code points equal to a given character.

Canonical: https://1loc.dev/string/count-the-occurrences-of-a-character-in-a-string/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

```javascript
function countOccurrences({ text, char }) { return Array.from(text).filter(item => item === char).length; }
```

## Input

```json
{
  "text": "ana@example.com",
  "char": "a"
}
```

## Expected output

```json
3
```

## Edge case

Input:
```json
{
  "text": "😀 and 😀",
  "char": "😀"
}
```
Output:
```json
2
```

## Limits

- Iterates code points, so emoji count once.

The lab validates types and size before calling this function. Add equivalent validation at your own trust boundary.

## Source and license

Original: https://github.com/phuocng/1loc/blob/14b481cf60dff1620ab1bb99a43b1f68068cdd9b/contents/count-the-occurrences-of-a-character-in-a-string.mdx
Author: Nguyen Huu Phuoc and original contributors
Contributors: See original repository history
Source commit: 14b481cf60dff1620ab1bb99a43b1f68068cdd9b
Copyright (c) 2020 phuoc-ng
License: MIT — https://1loc.dev/licenses/
Maintainer: Oveyon
Modifications: Keeps the code-point variant. Original MDX retained as inert source evidence.