1.90.2 Interval: basic
- at: index
- Answer the index-th element of the receiver.
- at: index put: anObject
- This method should not be called for instances of this class.
- collect: aBlock
- Evaluate the receiver for each element in aBlock,
collect in an array the result of the evaluations.
- do: aBlock
- Evaluate the receiver for each element in aBlock
- Answer a copy of the receiver with all of its items reversed
- Answer the number of elements in the receiver.
- Answer `Array'.