Stack is like an array but it has limited functionality which only limits you to push and pop element into your stack. With push, you add a new element on top of the array while pop remove the element from the top and returns the first element of the stack.

Do take note that this only work with Int given the type being used here. If you would like to use extend it to allow all type, you may use generic in this case.

A stack is also a LIFO or last-in-first-out order. The element being pushed last is the first one to come off in the next pop.

public struct Stack {
    var array = [Int]()

    mutating func push(_ number: Int) {

    mutating func pop() -> Int? {
        return array.popLast()

var stack = Stack(array: [1, 2, 3, 4])
// [1, 2, 3, 4, 10]

// [1, 2, 3, 4]

// [1, 2, 3]

// [1, 2]

// [1, 2, 15]


  • Article By :
    Founder of DaddyCoding. Studied Computer Science, Information System and Information Technology at BYU-Hawaii. Currently spending most of my time researching and learning on helping to expose making iOS apps.

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