---
title: "subscript(_:)"
framework: tabulardata
role: symbol
role_heading: Instance Subscript
path: "tabulardata/column/subscript(_:)-56i2s"
---

# subscript(_:)

Returns a column slice that includes elements that correspond to a collection of Booleans.

## Declaration

```swift
subscript<C>(mask: C) -> DiscontiguousColumnSlice<WrappedElement> where C : Collection, C.Element == Bool { get }
```

## Parameters

- `mask`: A Boolean collection. The subscript returns a slice that includes the column elements that correspond to the true elements in mask.

## Overview

Overview You can create a Boolean column for this subscript by comparing a column to a value of the column elements’ type. let followerColumn = artists["Followers", Int.self].filled(with: 0) let popularArtists = artists[followerColumn > 10_000_000]