---
title: "init(format:arguments:)"
framework: foundation
role: symbol
role_heading: Initializer
path: "foundation/nsexpression/init(format:arguments:)"
---

# init(format:arguments:)

Creates the expression with the specified expression format and arguments list.

## Declaration

```swift
init(format expressionFormat: String, arguments argList: CVaListPointer)
```

## Parameters

- `expressionFormat`: The expression format.
- `argList`: A list of arguments to be inserted into the expressionFormat string. The argument list is terminated by nil.

## Return Value

Return Value An initialized NSExpression object with the specified arguments.

## See Also

### Creating an Expression

- [init(expressionType:)](foundation/nsexpression/init(expressiontype:).md)
- [init(format:argumentArray:)](foundation/nsexpression/init(format:argumentarray:).md)
- [init(format:_:)](foundation/nsexpression/init(format:_:).md)
- [init(coder:)](foundation/nsexpression/init(coder:).md)