Prints the time taken to execute a closure.

measure.swift

/// Prints the time taken to execute a closure.
///
/// Note: Only for debugging purposes.
public func measure<T>(_ label: String = "", _ f: () throws -> (T)) rethrows -> T {
    let startTime = Date()
    let result = try f()
    let endTime = Date().timeIntervalSince(startTime)
    print("\(label): Time taken", endTime)
    return result
}