##CS373 Summer 2015: Marek Bejda ##CS N373 Software Engineering Week 7

Almost there, slowly passing the finish line. With the project finished we only have the final exam Monday. Today we had a great team study session in which we discussed almost everything refactoring, SQL, decorator functions, and much much more.

To prepare for this exam I focused on decorators. They seemed like the most confusing part of the last couple of weeks. So I rewrote Collatz max cycle length into using decorators. Mostly just extracting the for loop portion.

Pyhthon notebook

def pre( fun ):
    def check_preconditions(a,b):
        print("pre: ", a,b)
        assert(a > 0)
        assert(b > 0)
        return fun(a,b)
    return check_preconditions

def forloop ( fun ):
    def collatz(a,b):
        for i in range(a,b):            
            print("forloop: ", a,b)
            maxCycleLength = 0
            currentValue = a
            minValue = a
            maxValue = b
            value = a
            cycleLength=0
            for currentValue in range(minValue,maxValue+1):
                cycleLength = fun(currentValue)
                print("Cycle length: ", cycleLength)
                if cycleLength > maxCycleLength:
                    maxCycleLength = cycleLength
                    
            assert (maxCycleLength > 0)
            return maxCycleLength
    return collatz

def post(fun):
    def check_collatz(v):
        v =  fun(a,b)
        assert(v > 0)
        print("Checking V", v)
    return check_collatz

@pre
@forloop
@post
def collatz_eval(a):
    cycleLength = 1
    value = a
    while value != 1:
        if(value % 2 == 0):
            value //= 2
            cycleLength+=1
        else:
            value = value + (value>>1) + 1
            cycleLength+=2
                
    return cycleLength
 
a = collatz_eval(1,10)
print(a)
pre:  1 10
forloop:  1 10
Cycle length:  1
Cycle length:  2
Cycle length:  8
Cycle length:  3
Cycle length:  6
Cycle length:  9
Cycle length:  17
Cycle length:  4
Cycle length:  20
Cycle length:  7
20

##Crossfit.Social

Update on the project progress

• Database models for Athlete, Instagram, Twitter, Facebook
• Main pages and templates
• The unit tests are still at 90%
• Server up with catchy domain name crossfit.social!!
• Twitter, Instagram, Facebook integration mostly complete 99.9%!!
• Scraped Google for handles and accounts
• Semi stable virtual machine with Django running
• Integrated TravisCI and automated pushes

Need:

• Need to revamp the front end into pure bootstrap, replace current template
• Need to stabilize tests and server
• Need more information on front page and fix footer

##Tip of the Week
For this week I have like 20 tips, but to keep it simple I’ll just share 2. Well the first one was above I strongly recommend checking out the C++ modules repo. I also recommend playing with emcscripten.

Emscripten is an LLVM-to-JavaScript compiler. It takes LLVM bitcode - which can be generated from C/C++, using llvm-gcc (DragonEgg) or clang, or any other language that can be converted into LLVM - and compiles that into JavaScript, which can be run on the web (or anywhere else JavaScript can run).