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APPENDIX B RUBY REFERENCE
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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).
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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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Hash
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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.
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APPENDIX B RUBY REFERENCE
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empty : Returns true if the hash has no entries (that is, pairs of keys and values). has_key : Returns true if the hash has an entry with the supplied key. keys: Returns an array containing all the keys from the hash s entries. length (or size): Returns the number of entries within the hash. to_a: Returns an array representing the hash with each entry given an array containing its key and value. values: Returns an array containing all the values from the hash s entries.
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Integer
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Integer is the parent class of Fixnum and Bignum and is not generally used on its own.
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However, its methods are made available to both classes. The following are some of the most commonly used methods: chr: Returns a string containing an ASCII character of the code represented by the integer. For example: 65.chr == "A". downto(end_integer): Invokes the code block for each integer between that represented by the current object down to end_integer, passing each integer into the code block as i. next: Returns the next integer in ascending sequence from the current one. For example: 5.next == 6. times: Invokes the code block the number of times represented by the current object. The number of each iteration is passed to i. For example: 10.times { |i| puts "This is iteration #{i}" }. upto(end_integer): Invokes the code block for each integer between that represented by the current object up to end_integer, passing each integer into the code block as i.
Numeric
Float and Integer (and therefore Fixnum and Bignum) are subclasses of Numeric, and so inherit all Numeric s methods. Numeric objects aren t instantiated on their own. The follow-
ing are the most commonly used methods available to objects whose classes inherit from Numeric:
APPENDIX B RUBY REFERENCE
abs: Returns the absolute value of the object as another instance of that object. For example, the absolute value of -3 and 3 is 3. Therefore, -3.abs == 3. ceil: Rounds up a value to the nearest integer. For example: 1.2.ceil == 2. integer : Returns true if the object is of class Integer, otherwise false. Note that floats might contain integer values, but they aren t necessarily of class Integer. floor: Rounds down a value to the nearest integer. For example: 1.2.floor == 1. round: Rounds a value to the nearest integer. Note: 0.5 rounds up to 1. step(end_number, step_amount): Invokes the supplied code block, passing in numbers (to i) starting from the value of the object and going in steps of step_amount to end_number. zero : Returns true if the object represents zero, otherwise false.
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