Slicing

Slicing is an operation that can be performed on array and string values to pick out a subset of values.

var values = [ 1, 1, 2, 3, 5, 8, 13, 21 ];

var slice1 = values[1:6];
printLn(slice1.serialize()); // => [ 1, 2, 3, 5, 8, 13 ]

var slice2 = values[1:6:2];
printLn(slice2.serialize()); // => [ 1, 3, 8 ]

The slice takes three parameters: start index, end index, and step value. Negative indices will count backwards from the last value.

All of these parameters are optional:

• Start index will default to 0.
• End index will default to the last index.
• Step value will be 1 when the start index is less than the end index, otherwise it will be -1.

Slicing can be enabled for object values by implementing the __slice metamethod.