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package intelligentpathways.utils
{
/**
* Holds functional-style helpers.
*/
public
{
/**
* Generates a simple function that ignores all parameters and returns the requested value.
*/
public static : Function
{
return function(...rest) : *
{
return returnValue;
}
}
/**
* Does nothing.
* @param ignored
*/
public static : void {}
/**
* Reduces the incoming parameter count when the method is invoked. Sort of an uncurry(?), but throws out the extra parameters.
*
* Example use : Array.forEach() calls a Function of type f(item : *, i : Number, source : Array) - but you're only interested
* in the item parameter. You call would call: myArray.forEach(F.ignoreParameters(1, myOneParamFunction));
*
* @param targetFunction The function you wish to wrap
* @param toCount The number of parameters you wish to pass through when calling the targetFunction
*/
public static : Function
{
if (toCount == 0)
{
return function (...rest) : *
{
targetFunction();
};
}
return function (...rest) : *
{
if (rest.length <= toCount)
{
//Not enough params to throw out some, but try anyway, target function might be able to deal with it.
return targetFunction.apply(null, rest);
}
var tmp : Array = rest.slice(0, toCount);
return targetFunction.apply(null, tmp);
}
}
/**
* Calls a function n times, returning the results in an array
*
* @parameter times The repeat count
* @parameter callback A function. Signature is "f(i : Number) : *" - return null, it goes in the list. Return void or undefined and it won't.
*
* @return an array of all callback results that weren't undefined or null.
*/
public static : Array
{
var collectedResults : Array = [];
var i : uint;
for (i = 0; i < times; i++)
{
var funcResult : * = undefined;
funcResult = callback(i);
if (funcResult !== undefined) //NB: !== instead of !=
collectedResults.push(funcResult);
}
return collectedResults;
}
/**
* Beef rendang
*/
public static : Function
{
return function(...rest) : *
{
(rest as Array).unshift(firstParameter);
targetFunction.apply(null, rest);
}
}
/**
* Reduce / fold left. Non-recursive version since we've no tail-calls in AS, even if it's far less pretty than the proper version.
*
* @param f a function of signature f(lastValue : *, nextInput : *) : *
*
* TODO: Test this
*/
public static : *
{
var lastValue : * = seedInput;
var i : uint = 0;
input = input ? input : [];
for (i = 0; i < input.length; i++)
{
lastValue = f(lastValue, input[i]);
}
return lastValue;
}
/**
* Reduce / fold right. Non-recursive version since we've no tail-calls in AS, even if it's far less pretty than the proper version.
*
* @param f a function of signature f(lastValue : *, nextInput : *) : *
*
* TODO: Test this
*/
public static : *
{
var lastValue : * = seedInput;
var i : uint = 0;
input = input ? input : [];
for (i = input.length; i >=0 ; i--)
{
lastValue = f(lastValue, input[i]);
}
return lastValue;
}
/**
* This is just here as a Function in order to be reused with these helpers
*/
public static : Boolean
{
return left == right;
}
/**
* This is just here as a Function in order to be reused with these helpers
*/
public static : Boolean
{
return !equal(left, right);
}
/**
* A helper forEach that's nicer than Array.forEach (target only takes one param) and supports any iterable.
*
* @param targetFunction a funciont of signature f(item : *) : void {}
*/
public static : void
{
for each (var item : * in list)
{
targetFunction(item);
}
}
/**
* TODO: DOCUMENT ME!
*
* @param list
* @param targetFunction
* @return
*
*/
public static : Array
{
var arr : Array = [];
for each (var item : * in list)
{
arr.push(targetFunction(item));
}
return arr;
}
/**
* A helper eqiv of Array.every() that's nicer than Array.every (target only takes one param) and supports any iterable.
*
* @param targetFunction a funciont of signature f(item : *) : Boolean {}
*/
public static : Boolean
{
for each (var item : * in list)
{
if (!targetFunction(item))
return false;
}
return true;
}
}
}
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