How do I check if an array index is out of range SWIFT [duplicate]

Question

I want to be able to check when my array index goes out of range. The array elements are all strings, so I tried to do something like this but it doesn't work:

if questions[3] != nil {
}

Can someone just show me how to check?

Answer 1

Before indexing into the array, you need to check:

1. The intended index is not below 0
2. array's count is above the intended index

---

let intendedIndex: Int = 3

if (intendedIndex >= 0 && questions.count > intendedIndex) {
    // This line will not throw index out of range:
    let question3 = questions[intendedIndex]
}