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Re:Ruby basics (1 viewing) (1) Guest
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TOPIC: Re:Ruby basics
#4475
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Hash Built-in Methods

We need to have an instance of Hash object to call a Hash method


for instance following is the way to create an instance of Hash object:

Hash[key =>|, value]* ] or

Hash.new [or] Hash.new(obj) [or]

Hash.new { |hash, key| block }


This will returns a new hash populated with the given objects.

Now using created object we can call any available instance methods
 
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#4476
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Let us discuss some of the public hash methods ( Assuming hash is an array object )



hash == other_hash

Tests whether two hashes are equal, based on whether they have the same number of key-value pairs, and whether the key-value pairs match the corresponding pair in each hash.
 
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#4477
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
hash.[key]

Using a key, references a value from hash. If the key is not found, returns a default value.


hash.[key]=value


Associates the value given by value with the key given by key.
 
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#4478
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
hash.clear

Removes all key-value pairs from hash.

hash.default(key = nil)

Returns the default value for hash, nil if not set by default=. (ash.clear

Removes all key-value pairs from hash.

hash.default(key = nil)

Returns the default value for hash, nil if not set by default=. ([] returns a default value if the key does not exist in hash.)
 
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#4479
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
hash.default = obj

Sets a default value for hash.

hash.default_proc

Returns a block if hash was created by a block.
 
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#4480
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
hash.inspect

Returns a pretty print string version of hash.

hash.invert

Creates a new hash, inverting keys and values from hash; that is, in the new hash, the keys from hash become values, and values become
keys.

hash.keys

Creates a new array with keys from hash.
 
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