Scala:slice（）的性能未达到预期

我正在写一小段代码，它将遍历1000位数字，每一步取13位。例如，在第一次迭代中，应在0-13处取数字，在下一次迭代中，应在1-14处取数字，依此类推。这是我的代码，但当我遍历大量数据时，我的切片会不断变小。我想每次从原始字符串中切掉13位数字。我做错了什么

val largeNumber = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450"
var current13Digits = ""

for (iterator <- 0 to (largeNumber.length-13))
  {
            println("CURRENT VALUE OF ITERATOR IS " + iterator)
            current13Digits = largeNumber.slice(iterator,13)
            println("CURRENT 13 DIGITS ARE " + current13Digits)
  }

CURRENT VALUE OF ITERATOR IS 0
CURRENT 13 DIGITS ARE 7316717653133
CURRENT VALUE OF ITERATOR IS 1
CURRENT 13 DIGITS ARE 316717653133
CURRENT VALUE OF ITERATOR IS 2
CURRENT 13 DIGITS ARE 16717653133
CURRENT VALUE OF ITERATOR IS 3
CURRENT 13 DIGITS ARE 6717653133
CURRENT VALUE OF ITERATOR IS 4
CURRENT 13 DIGITS ARE 717653133
CURRENT VALUE OF ITERATOR IS 5
CURRENT 13 DIGITS ARE 17653133
CURRENT VALUE OF ITERATOR IS 6
CURRENT 13 DIGITS ARE 7653133
CURRENT VALUE OF ITERATOR IS 7
CURRENT 13 DIGITS ARE 653133
CURRENT VALUE OF ITERATOR IS 8
CURRENT 13 DIGITS ARE 53133
CURRENT VALUE OF ITERATOR IS 9
CURRENT 13 DIGITS ARE 3133
CURRENT VALUE OF ITERATOR IS 10
CURRENT 13 DIGITS ARE 133
CURRENT VALUE OF ITERATOR IS 11
CURRENT 13 DIGITS ARE 33
CURRENT VALUE OF ITERATOR IS 12
CURRENT 13 DIGITS ARE 3
CURRENT VALUE OF ITERATOR IS 13
CURRENT 13 DIGITS ARE 
CURRENT VALUE OF ITERATOR IS 14
CURRENT 13 DIGITS ARE 
CURRENT VALUE OF ITERATOR IS 15
CURRENT 13 DIGITS ARE .....

---

谢谢，滑动非常好用

val current13Digits = largeNumber.sliding(13)
while(current13Digits.hasNext)
  {
    current13DigitsAsString = current13Digits.next()
    println("CURRENT 13 DIGITS ARE " + current13DigitsAsString
    ...
  }

---

你误解了这些论点。第二个是绝对结束索引，而不是切片长度。查看Scaladoc。看起来您希望使用

.slideing（13）

largeNumber.slideing（13）.foreach（s=>println（“当前13位数字为“+s”）