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create website online create website online We have three obvious choices. We could use the Ruby Array type, use the Ruby Hash type, or create our own list structure. Being lazy, for now we'll look at arrays and hashes, and choose one of these for our class.Arrays The class Array holds a collection of object references. Each object reference occupies a position in the array, identified by a non-negative integer index.

create website online You can create arrays using literals or by explicitly creating an Array object. A literal array is simply a list of objects between square brackets. a = [ 3.14159, "pie", 99 ] a.type » Array a.

create website online length » 3 a[0] » 3.14159 a[1] » "pie" a[2] » 99 a[3] » nil b = Array.new b.type » Array b.length » 0 b[0] = "second" b[1] = "array" b » ["second", "array"] Arrays are indexed using the [] operator.

create website online As with most Ruby operators, this is actually a method (in class Array) and hence can be overridden in subclasses. As the example shows, array indices start at zero. Index an array with a single integer, and it returns the object at that position or returns nil if nothing's there. Index an array with a negative integer, and it counts from the end. This is shown in Figure 4.

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