.NET/Java PDF, Tiff, Barcode SDK Library

Enumerable is a module that s automatically mixed in to Array and Hash classes. Therefore,

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you can also use the methods in this section upon arrays and hashes. In these references, the parent array or hash is referred to as a collection. The following methods are available and are the most commonly used: all : Invokes the supplied code block for every element of the collection. It ultimately returns true or false depending on whether, for every element, each call to the code block returned true. any : Invokes the code block for every element of the collection and ultimately returns true or false depending on whether, for any element, a code block returned true. collect: Returns an array of the results obtained by passing each element of the collection into a supplied code block. For example: %w{this is a test}.collect { |i| i * 2 } == ["thisthis", "isis", "aa", "testtest"]. find (or detect): Passes each element of the collection to a supplied code block and returns the first for which the code block evaluates to true. find_all (or select): Passes each element of the collection to a supplied code block and returns all for which the code block evaluates to true.

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This may seem similar to concatenation, but the important difference is that the extended sequence (in this case, a) is modified. This is not the case in ordinary concatenation, in which a completely new sequence is returned: >>> >>> >>> [1, >>> [1, a = [1, 2, 3] b = [4, 5, 6] a + b 2, 3, 4, 5, 6] a 2, 3]

include : Returns true if the supplied object is also found within the collection. min: Returns the object within the collection with the smallest (minimum) value. max: Returns the object within the collection with the largest (maximum) value. sort (and sort!): Sorts the elements of the collection, returning a new collection or in place (with sort!). The sorting uses the <=> comparison operator of each object. You can also supply an optional code block with which to perform custom sorts. sort_by: Sorts the collection using the values generated by an invoked code block (to which each element of the collection is passed).

Objects of the Float class represent floating point or decimal numbers. They have the same arithmetic methods as Bignum and Fixnum (see the section Bignum and Fixnum ), but don t have any bitwise methods, as they are internally represented in an entirely different way to integers. Refer to Bignum and Fixnum for arithmetic methods, and to Numeric for other inherited methods.

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See Enumerable, a module that s mixed in with Array, for more methods. The following are some of the most popular methods made available by Hash objects: clear: Removes all key and value pairs from the hash. delete: Deletes the hash entry whose key is equal to the supplied object. delete_if: Deletes all hash entries where, for a code block invoked with the key and value, true is returned. For example: { :a => 10, :b => 20, :c => 30 }.delete_if { |k, v| v > 10 } == { :a => 10 }. each: Invokes a supplied code block once for each entry in the hash, passing in the key and value of that element as two parameters. each_key: Invokes a supplied code block once for each entry in the hash, passing in the key only. each_value: Invokes a supplied code block once for each entry in the hash, passing in the value only.