# replace(with:where:) Replaces elements of this vector with elements of `other` in the lanes where `mask` is `true`. ``` mutating func replace(with other: SIMDMask, where mask: SIMDMask) ``` ## Discussion Equivalent to: ``` for i in indices { if mask[i] { self[i] = other[i] } } ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)