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# distance(from:to:)

Returns the distance between two indices.

```
func distance(from start: String.Index, to end: String.Index) -> Int
```

## Parameters

`start`

A valid index of the collection.

`end`

Another valid index of the collection. If `end` is equal to
`start`, the result is zero.

## Return Value

The distance between `start` and `end`.

## Discussion> Complexity: O(*n*), where *n* is the resulting distance.

---

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