Created
March 12, 2018 23:46
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import Foundation | |
struct Stack { | |
private var items: [String] = [] | |
func peek() -> String { | |
guard let topElement = items.first else { fatalError("This stack is empty.") } | |
return topElement | |
} | |
mutating func pop() -> String { | |
return items.removeFirst() | |
} | |
mutating func push(_ element: String) { | |
items.insert(element, at: 0) | |
} | |
} | |
var nameStack = Stack() | |
print(nameStack) | |
nameStack.push("Caleb") | |
nameStack.push("Charles") | |
nameStack.push("Tina") | |
print(nameStack) | |
nameStack.peek() | |
print(nameStack) | |
nameStack.pop() | |
print(nameStack) | |
extension Stack: CustomStringConvertible { | |
var description: String { | |
let topDivider = "---Stack---\n" | |
let bottomDivider = "\n-----------\n" | |
let stackElements = items.joined(separator: "\n") | |
return topDivider + stackElements + bottomDivider | |
} | |
} |
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