---
title: "init(upstream:scheduler:)"
framework: combine
role: symbol
role_heading: Initializer
path: "combine/publishers/measureinterval/init(upstream:scheduler:)"
---

# init(upstream:scheduler:)

Creates a publisher that measures and emits the time interval between events received from an upstream publisher.

## Declaration

```swift
init(upstream: Upstream, scheduler: Context)
```

## Parameters

- `upstream`: The publisher from which this publisher receives elements.
- `scheduler`: A scheduler to use for tracking the timing of events.