---
title: "reset(roundingBackwardsFrom:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/utf8span/unicodescalariterator/reset(roundingbackwardsfrom:)"
---

# reset(roundingBackwardsFrom:)

Reset to the nearest scalar-aligned code unit offset <= i.

## Declaration

```swift
mutating func reset(roundingBackwardsFrom i: Int)
```

## Discussion

Discussion func printScalarAfterReset(_ string: borrowing String) {     var iterator = string.utf8Span.makeUnicodeScalarIterator()     iterator.reset(roundingBackwardsFrom: 8)  // Position 8 is mid-emoji, rounds back to 6     if let scalar = iterator.next() {         print(scalar)  // Prints "🌍" (emoji starts at byte 6)     } } let string = "Hello 🌍" printScalarAfterReset(string) note: O(1)