---
title: "+=(_:_:)"
framework: tabulardata
role: symbol
role_heading: Operator
path: "tabulardata/columnslice/+=(_:_:)-4bgdt"
---

# +=(_:_:)

Modifies a column slice by adding each optional value in a collection to the corresponding element in the column.

## Declaration

```swift
static func += <C>(lhs: inout ColumnSlice<WrappedElement>, rhs: C) where WrappedElement : AdditiveArithmetic, C : Collection, C.Element == WrappedElement?
```

## Parameters

- `lhs`: A column.
- `rhs`: A collection that contains elements of the same type as the column’s elements.

## See Also

### Modifying a Column Slice with a Collection of Values

- [+=(_:_:)](tabulardata/columnslice/+=(_:_:)-47cwm.md)
- [-=(_:_:)](tabulardata/columnslice/-=(_:_:)-3kauw.md)
- [-=(_:_:)](tabulardata/columnslice/-=(_:_:)-1bqy4.md)
- [*=(_:_:)](tabulardata/columnslice/*=(_:_:)-7lz8l.md)
- [*=(_:_:)](tabulardata/columnslice/*=(_:_:)-3v2q0.md)
- [/=(_:_:)](tabulardata/columnslice/_=(_:_:)-46jci.md)
- [/=(_:_:)](tabulardata/columnslice/_=(_:_:)-8frqe.md)
- [/=(_:_:)](tabulardata/columnslice/_=(_:_:)-1fciw.md)
- [/=(_:_:)](tabulardata/columnslice/_=(_:_:)-6ujes.md)