Swift set cut scores

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:

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。[……]

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