January 2024
Intermediate to advanced
718 pages
20h 15m
English
Content preview from Programming Ruby 3.3
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Ranges
Ranges occur everywhere: January to December, 0 to 9, rare to well done, lines 50 through 67, and so on. If Ruby is to help us model reality, it seems natural for it to support these ranges. In fact, Ruby goes one better: it uses ranges to implement sequences and intervals.
Ranges as Sequences
The first and perhaps most natural use of ranges is to express a sequence of values. Sequences have a start point, an end point, and a way to produce successive values in the sequence. In Ruby, these sequences are created using the .. and ... range operators. The two-dot form creates an inclusive range, and the three-dot form creates a range that excludes the specified high value:
| | 1..10 |
| | "a".."z" |
| | 0...3 |
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