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Re:Ruby basics (1 viewing) (1) Guest
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TOPIC: Re:Ruby basics
#4487
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Ranges occur everywhere: January to December, 0 to 9, lines 50 through 67, and so on.

Ruby supports ranges and allows us to use ranges in a variety of ways:

Ranges as Sequences

Ranges as Conditions

Ranges as Intervals
 
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#4488
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
The first and perhaps most natural use of ranges is to express a sequence.

Sequences have a start point, an end point, and a way to produce successive values in the sequence
 
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#4489
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Ruby creates these sequences using the ''..'' and ''...'' range operators.

The two-dot form creates an inclusive range, while the three-dot form creates a range that excludes the specified high value.
 
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#4490
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
The sequence 1..100 is held as a Range object containing references to two Fixnum objects.

If we need we can convert a range to a list using the to_a method
 
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#4491
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Ranges as Intervals

A final use of the versatile range is as an interval test: seeing if some value falls within the interval represented by the range.

This is done using ===, the case equality operator
 
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#4492
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Ranges as Conditions

Ranges may also be used as conditional expressions.

Ranges implement methods that let us to iterate over them and test their contents in a variety of ways
 
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