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balisong

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源码售价： 5 个金币积分规则积分充值

资源说明：Utility for carving up collections (arrays and structs)

h1. Balisong: Map, Reduce, Fold, and banana slicer for ColdFusion 9

Simple _functional_ approach for recursively applying a given function to each element of a collection (array, list, or struct).  One common view is to think of passing a function to some data, rather than passing the data to a function. Example (included in source):

 
/**
* Recursively increments each numeric value in the collection (array,list,or struct). 
*/
public function inc(any collection){
  return balisong.apply(_inc,collection);
}
...

/**
* The function to apply to each element of the collection. If the value is not numeric, 
* inc() just returns the value. Note that in languages that support lambda functions ,
* the definition of the function is frequently specified in-line with the call to apply. However,  
* with ColdFusion, you need to write an _external_ function. This is not necessarily a bad thing,
* as it allows the function being applied to the data to be tested directly.
*/
public function _inc(any val){
 if( isNumeric(val) ) return ++val;
 return val;
}

...

//Usage:
function incrementEachNumericInAnArray(){
	var original = [ 1,2,3 ];
	var new_data = mr.inc(a);
	assert( new_data[1] ==2 && new_data[2] ==3 && new_data[3] ==4  );
}





h3. Goals

# Functions do not alter any arguments
# Functions return *new* objects (see #1)
# Functions act recursively on all collections
# Functions do not depend on instance data and can be wired or mixed in
# Functions use as few possible local variables in functions to minimize use of state

h3. Known Issues

# Ordering of resultant new collections is non-deterministic
# Lists are still returned as an array
# Some functions that could work on structs, too, still only work on arrays

h4. Pull requests welcome!

h2. Function summary (alphabetical):

See the "Balisong Wiki Page":http://wiki.github.com/virtix/balisong/banana-slicing-examples  for examples


h3. @[boolean]  all(string predicate, any collection)@

bq. Returns true if _every_ element in the collection satisfies the predicate.





h3. @[boolean]  any(string predicate, any collection)@

bq. Returns true if _any_ element in the collection satisfies the predicate.





h3. @[array|struct] apply(any a_function, any collection)@

bq. Applies a_function to every element in the collection and returns a new collection





h3. @[boolean]   exists(string predicate, any collection)@

bq. Returns true if at least one element in the collection satisfies the predicate





h3. @[numeric]   count(string predicate, any collection)@

bq. Returns the number of elements in this collection that satisfies the predicate





h3. @[void]   foreach(any a_function, any collection)@

bq. Executes a_function for every element in the collection. Does not return a value. *WARNING: This _can_ mutate the original collections argument.*





h3. @[numeric]   foldLeft(array a, string operator, numeric start)@

bq. _Folds_ all elements of this array starting at the left into a new array using @operator@ (+ or *) and @start@ as the initial value





h3. @[numeric]   foldRight(array a, string operator, numeric start)@

bq. _Folds_ all elements of this array starting at the right into a new array using @operator@ (+ or *) and @start@ as the initial value





h3. @[numeric]   reduceLeft(array a, string operator, numeric start)@

bq. _Reduces_ all elements of this array starting at the left into a new array using @operator@ (+ or *) and @start@ as the initial value





h3. @[numeric]   reduceRight(array a, string operator, numeric start)@

bq. _Reduces_ all elements of this array starting at the right into a new array using @operator@ (+ or *) and @start@ as the initial value





h3. @[array]   flatten(array collection)@

bq. Flattens all elements of this array into a new 1 dimensional array





h3. @[array|struct]    concat(any a1, any a2, ..any aN)@

bq. Concatenates N collections into a single collection (arrays and structs) 





h3. @[array|struct]    filter(string predicate, any collection)@

bq. Creates  new collection based on all elements in the collection that satisfy the predicate

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