arrays - Swift for循环：用于索引，数组中的元素？(Swift for loop: for index, element in array?)

Question

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

(有没有可以用来遍历数组并具有索引和元素的函数，例如python的enumerate？)

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

  ask by thinker3 translate from so

Answer 1

Yes.

(是。)

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.

(从Swift 3.0开始，如果需要每个元素的索引及其值，则可以使用enumerated()方法遍历数组。)

It returns a sequence of pairs composed of the index and the value for each item in the array.

(它返回由索引和数组中每个项目的值组成的对对的序列。)

For example:

(例如：)

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

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

(在Swift 3.0之前和Swift 2.0之后，该函数称为enumerate() ：)

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

Prior to Swift 2.0, enumerate was a global function.

(在Swift 2.0之前， enumerate是一个全局函数。)

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