Long multiplication: Difference between revisions

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@@ Line 2,469: / Line 2,469: @@
     }
-    val stringResultBuilder = StringBuilder(result.size)
+    return result.foldRight(StringBuilder(result.size), { digit, sb ->
+        if (digit != 0 || sb.length > 0) sb.append('0' + digit)
-    result.reversed().mapIndexed { i, digit ->
+        sb
-        if (digit != 0 || stringResultBuilder.length > 0)
+    }).toString()
-            stringResultBuilder.append(('0' + digit).toChar())
-    }
-    return stringResultBuilder.toString()
 }
@@ Line 2,480: / Line 2,478: @@
     println("18446744073709551616" * "18446744073709551616")
 }</lang>
 =={{header|Liberty BASIC}}==