Returns true if the provided constant path is defined in Java

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Returns true if the provided constant path is defined
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qualified name for(parent module, constant name)
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Returns a qualified path for the specified parent_module and constant_name
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B17 ActiveSupport::Duration
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remove unloadable constants!
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Removes the constants that have been autoloaded, and those that have been marked for unloading
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Active Support
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require or load(file name, const path = nil)
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Implements the main classloading mechanism Wrapped by the require_or_load method of Object
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search for file(path suffix)
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Searches for a file in load_paths matching the provided path_suffix
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will unload (constant)
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Returns true if the specified constant is queued for unloading on the next request
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B16 ActiveSupport::Deprecation
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The deprecate method provides Rails core and application developers with a formal mechanism to be able to explicitly state what methods are deprecated (Deprecation means to mark for future deletion) Rails will helpfully log a warning message when deprecated methods are called
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Deprecationdeprecate methods(target module, *method names)
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Deprecationsilence(&block)
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Silence deprecation warnings within the block
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B17 ActiveSupport::Duration
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Provides accurate date and time measurements using the advance method of Date and Time It mainly supports the methods on Numeric, such as in this example:
1monthago # equivalent to Timenowadvance(:months => -1)
B171 active support/duration
+ (other)
Adds another Duration or a Numeric to this Duration Numeric values are treated as seconds
>> 2hours + 2 => 7202 seconds
Appendix B: Active Support API Reference
- (other)
Subtracts another Duration or a Numeric to this Duration Numeric values are treated as seconds
>> 2hours - 2 => 7198 seconds
ago(time = Timenow)
Calculates a new Time or Date that is as far in the past as this Duration represents
>> birth = 35yearsago => Mon, 21 Apr 1975 00:48:43 UTC +00:00
from now(time = Timenow)
Alias for since, which reads a little bit more naturally when using the default Timenow as the time argument
>> expiration = 1yearfrom_now => Thu, 21 Apr 2011 00:51:48 UTC +00:00
inspect
Calculates the time resulting from a Duration expression and formats it as a string appropriate for display in the console (Remember that IRB and the Rails console automatically invoke inspect on objects returned to them You can use that trick with your own objects)
>> 10yearsago => Sun Aug 31 17:34:15 -0400 1997
since(time = Timenow)
Calculates a new Time or Date that is as far in the future as this Duration represents
>> expiration = 1yearsince(accountcreated_at)
until(time = Timenow)
Alias for ago Reads a little more naturally when specifying a time argument instead of using the default value, Timenow
>> membership_duration = created_atuntil(expires_at)
B18 Enumerable
B18 Enumerable
Extensions to Ruby s built-in Enumerable module, which gives arrays and other types of collections iteration abilities
Active Support
B181 active support/core ext/enumerable
The following methods are added to all Enumerable objects
each with object(memo, &block)
Iterates over a collection, passing the current element and the memo to the block Handy for building up hashes or reducing collections down to one object Examples:
>> %w(foo bar)each_with_object({}) { |str, hsh| hsh[str] = strupcase } => {'foo' => 'FOO', 'bar' => 'BAR'}
Note: that you can t use immutable objects (like numbers, true, false, etc) as the memo argument You would think the following returns 120, but since the memo is never changed, it does not (15)each with object(1) }value, memo} memo *= value # => 1
group by(&block)
Collects an enumerable into sets, grouped by the result of a block and ordered Useful, for example, for grouping records by date like in the following example:
latest_transcriptsgroup_by(&:day)each do |day, transcripts| puts "[#{day}] #{transcriptsmap(&:class)join , }" end "[2006-03-01] Transcript" "[2006-02-28] Transcript" "[2006-02-27] Transcript, Transcript"
Rubys own group_by method is used in versions 19 and above
index by
Converts an enumerable to a hash, based on a block that identifies the keys The most common usage is with a single attribute name:
>> peopleindex_by(&:login) => { "nextangle" => <Person >, "chad" => <Person >}
Use full block syntax (instead of the to_proc hack) to generate more complex keys:
>> peopleindex_by { |p| "#{pfirst_name} #{plast_name}" } => {"Chad Fowler" => <Person >, "David Hansson" => <Person >}
Appendix B: Active Support API Reference
sum(default = 0, &block)
Calculates a sum from the elements of an enumerable, based on a block
paymentssum(&:price)
Its easier to understand than Rubys clumsier inject method:
paymentsinject { |sum, p| sum + pprice }
Use full block syntax (instead of the to_proc hack) to do more complicated calculations:
paymentssum { |p| pprice * ptax_rate }
Also, sum can calculate results without the use of a block:
[5, 15, 10]sum # => 30
The default identity (a fancy way of saying, the sum of an empty list ) is 0 However, you can override it with anything you want by passing a default argument:
[]sum(10) { |i| iamount } # => 10
index by
Converts an enumerable to a hash, based on a block that identifies the keys The most common usage is with a single attribute name:
>> peopleindex_by(&:login) => { "nextangle" => <Person >, "chad" => <Person >}
Use full block syntax (instead of the to_proc hack) to generate more complex keys:
>> peopleindex_by { |p| "#{pfirst_name} #{plast_name}" } => {"Chad Fowler" => <Person >, "David Hansson" => <Person >}