How to iterate a loop with index and element in Swift

arrays swift enumeration
thinker3 picture thinker3 · Jun 4, 2014 · Viewed 491k times · Source

Is there a function that I can use to iterate over an array and have both index and element, like Python's enumerate?

for index, element in enumerate(list):
    ...

Answer

Cezar picture Cezar · Jun 4, 2014

Yes. As of Swift 3.0, if you need the index for each element along with its value, you can use the enumerated() method to iterate over the array. It returns a sequence of pairs composed of the index and the value for each item in the array. For example:

for (index, element) in list.enumerated() {
  print("Item \(index): \(element)")
}

Before Swift 3.0 and after Swift 2.0, the function was called enumerate():

for (index, element) in list.enumerate() {
    print("Item \(index): \(element)")
}

Prior to Swift 2.0, enumerate was a global function.

for (index, element) in enumerate(list) {
    println("Item \(index): \(element)")
}

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