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create website online create website online a = [ 1, 3, 5, 7, 9 ] » [1, 3, 5, 7, 9] a[1] = 'bat' » [1, "bat", 5, 7, 9] a[-3] = 'cat' » [1, "bat", "cat", 7, 9] a[3] = [ 9, 8 ] » [1, "bat", "cat", [9, 8], 9] a[6] = 99 » [1, "bat", "cat", [9, 8], 9, nil, 99] If the index to []= is two numbers (a start and a length) or a range, then those elements in the original array are replaced by whatever is on the right-hand side of the assignment. If the length is zero, the right-hand side is inserted into the array before the start position; no elements are removed. If the right-hand side is itself an array, its elements are used in the replacement. The array size is automatically adjusted if the index selects a different number of elements than are available on the right-hand side of the assignment. a = [ 1, 3, 5, 7, 9 ] » [1, 3, 5, 7, 9] a[2, 2] = 'cat' » [1, 3, "cat", 9] a[2, 0] = 'dog' » [1, 3, "dog", "cat", 9] a[1, 1] = [ 9, 8, 7 ] » [1, 9, 8, 7, "dog", "cat", 9] a[0.

create website online .3] = [] » ["dog", "cat", 9] a[5] = 99 » ["dog", "cat", 9, nil, nil, 99] Arrays have a large number of other useful methods. Using these, you can treat arrays as stacks, sets, queues, dequeues, and fifos. A complete list of array methods starts on page 278.Hashes Hashes (sometimes known as associative arrays or dictionaries) are similar to arrays, in that they are indexed collectives of object references.

create website online However, while you index arrays with integers, you can index a hash with objects of any type: strings, regular expressions, and so on. When you store a value in a hash, you actually supply two objects---the key and the value. You can subsequently retrieve the value by indexing the hash with the same key. The values in a hash can be any objects of any type. The example that follows uses hash literals: a list of key => value pairs between braces.

create website online h = { 'dog' => 'canine', 'cat' => 'feline', 'donkey' => 'asinine' } h.length » 3 h['dog'] » "canine" h['cow'] = 'bovine' h[12] = 'dodecine' h['cat'] = 99 h » {"cow"=>"bovine", "cat"=>99, 12=>"dodecine", "donkey"=>"asinine", "dog"=>"canine"} Compared with arrays, hashes have one significant advantage: they can use any object as an index. However, they also have a significant disadvantage: their elements are not ordered, so you cannot easily use a hash as a stack or a queue. You'll find that hashes are one of the most commonly used data structures in Ruby. A full list of the methods implemented by class Hash starts on page 317.

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