Just playing around with Objective-C Blocks... I like them and all things functional...

blockTest.m

//
//  blockTest.m
//  blocksTest
//
//  Created by Christopher Woodall on 6/14/11.
//  Copyright 2011 Christopher Woodall.
//  MIT License
//

#import <Foundation/Foundation.h>
#import <Block.h>
#import <stdio.h>

typedef float(^Equation)(float[]); // To clean things up a little

// Impractical, but sets up a function which will process a list of values through an function.
// The function will process the list as if it were a series of inputs into some equation.
float equation (float a[], Equation func)
{    
    return func(a);
}

int main (int argc, const char * argv[])
{

    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    float res;
    float list[3] = {9, 12.2, 5.7};
    
    // Define the function through which our list will be subjected to
    Equation sum = ^ float (float a[]){
        float store = 0; // initial value of zero.
                         // BAD: should set to the first value in the array a[]
        // Go through the array until the end is reached and sum all the numbers together
        for (int i = 0; i <= sizeof(a)/sizeof(float); i++) 
            store += a[i];

        return store;
    };
    
    res = equation(list, sum); // Result is: 26.900
    NSLog(@"Val of a + b is %.3f", res); 
    

    [pool drain];
    return 0;
}