in most cases，If we want to get the contents of a section of the array (for example, front-to-middle，Some of the values of the array or the last)，This time you need to traverse the array to assign a new array：
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1 2 3 4 5 6 7 |
let fixedArray = [1,2,3,4,5,6] var myArray:[Int] = [] for (i,n) in fixedArray.enumerate() { if i > 3 {break} myArray.append(n) } |
Such an array of short, better said it does not matter，However, if the array is relatively large and we need to value and more，It is clear that it is a waste of time to traverse up。
Swift in itself provides an array of features split，This mechanism is called [crayon-679bca[……]
