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# init(string:)

Returns an `NSString` object initialized by copying the characters from another given string.

```
convenience init(string aString: String)
```

## Parameters

`aString`

The string from which to copy characters. This value must not be `nil`.
  
  > Important:
  > Raises an `NSInvalidArgumentException` if `aString` is `nil`.

## Return Value

An `NSString` object initialized by copying the characters from `aString`. The returned object may be different from the original receiver.

## See Also

[`+  stringWithString:`](/documentation/Foundation/NSString/stringWithString:)

Returns a string created by copying the characters from another given string.


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