Operator

...(_:)

Returns a partial range up to, and including, its upper bound.

Declaration

prefix static func ... (maximum: Subscribers.Demand) -> PartialRangeThrough<Subscribers.Demand>

Parameters

maximum

The upper bound for the range.

Discussion

Use the prefix closed range operator (prefix ...) to create a partial range of any type that conforms to the Comparable protocol. This example creates a PartialRangeThrough<Double> instance that includes any value less than or equal to 5.0.

let throughFive = ...5.0

throughFive.contains(4.0)     // true
throughFive.contains(5.0)     // true
throughFive.contains(6.0)     // false

You can use this type of partial range of a collection’s indices to represent the range from the start of the collection up to, and including, the partial range’s upper bound.

let numbers = [10, 20, 30, 40, 50, 60, 70]
print(numbers[...3])
// Prints "[10, 20, 30, 40]"

See Also

Performing Mathematical Operations

static func * (Subscribers.Demand, Int) -> Subscribers.Demand

Returns the result of multiplying a demand by an integer.

static func *= (inout Subscribers.Demand, Int)

Multiplies a demand by an integer, and assigns the result to the demand.

static func + (Subscribers.Demand, Int) -> Subscribers.Demand

Returns the result of adding an integer to a demand.

static func += (inout Subscribers.Demand, Subscribers.Demand)

Adds two demands, and assigns the result to the first demand.

static func += (inout Subscribers.Demand, Int)

Adds an integer to a demand, and assigns the result to the demand.

static func - (Subscribers.Demand, Subscribers.Demand) -> Subscribers.Demand

Returns the result of subtracting one demand from another.

static func - (Subscribers.Demand, Int) -> Subscribers.Demand

Returns the result of subtracting an integer from a demand.

static func -= (inout Subscribers.Demand, Subscribers.Demand)

Subtracts one demand from another, and assigns the result to the first demand.

static func -= (inout Subscribers.Demand, Int)

Subtracts an integer from a demand, and assigns the result to the demand.

static func ... (Subscribers.Demand) -> PartialRangeFrom<Subscribers.Demand>

Returns a partial range extending upward from a lower bound.