# Count the occurrences of a value in an array

Count items strictly equal to a value.

Canonical: https://1loc.dev/array/count-the-occurrences-of-a-value-in-an-array/
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({ values, value }) { return values.filter(item => item === value).length; }
```

## Input

```json
{
  "values": [
    "delivered",
    "deferred",
    "delivered"
  ],
  "value": "delivered"
}
```

## Expected output

```json
2
```

## Edge case

Input:
```json
{
  "values": [
    1,
    "1"
  ],
  "value": 1
}
```
Output:
```json
1
```

## Limits

- Strict equality: 1 and "1" differ.

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-value-in-an-array.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 filter variant. Original MDX retained as inert source evidence.