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# isSubset

> Checks if the first array is a subset of the second array.

## Signature

```typescript path=null start=null theme={null}
isSubset<T>(arr1: T[], arr2: T[]): boolean
```

## Type Parameters

* **T** - The type of the array elements.

## Parameters

* **arr1**: `T[]` - The first array.
* **arr2**: `T[]` - The second array.

## Returns

`boolean` - Returns true if every element in arr1 is included in arr2, otherwise returns false.

## Source

Defined in [array.ts:133](https://github.com/koji/ichigyou/blob/main/src/array.ts#L133)