Swift Array - Check if an index exists

Question

In Swift, is there any way to check if an index exists in an array without a fatal error being thrown?

I was hoping I could do something like this:

let arr: [String] = ["foo", "bar"]
let str: String? = arr[1]
if let str2 = arr[2] as String? {
    // this wouldn't run
    println(str2)
} else {
    // this would be run
}

But I get

fatal error: Array index out of range

Answer 1

An elegant way in Swift:

let isIndexValid = array.indices.contains(index)