duplicates:

• SR-2909 Array should have an initializer that reserves capacity

Issue Description:

Array and RangeReplaceableCollection has declared function reserveCapacity()

mutating func reserveCapacity(_:) { ... }

and there is no initializer that allows get Array with reserverCapacity, like

init(minimumCapacity: Int)

therefore to get empty array with reserved capacity I have to do

var arr = Array<Int>()
arr.reserveCapacity(500)

that looks like unecessary. What if we have convenient initializer with minimum capacity parameter so empty array capacity don't have to be reallocated after allocation.