Meal Planning

Ok, while deciding what recipes I would shop for now that I’m unemployed (because obviously when you’re unemployed it is time to COOK ALL THE TIME), I decided to make a lil Python program that will let me enter recipes, and at a point in the future, probably after I learn regex, make it fully searchable. I’m already separating things out for ease of searching – like lists both with and without quantity indications.

Problems I’ve solved: a) making a new file name out of whatever the user enters, and b) setting a var for the long combination of dir, name & .txt that I’ll use in a few different places throughout the program

global new_filename
new_filename = "recipes/" + new_recipe + ".txt"
open(new_filename, 'a') # 'a' for append

Iterating through a list which adds to another list with some clever while looping

def ingredient_input():
    ingredient = 0  # is it ok to set this var to a dummy value?  it gets redefined with each loop.
    while ingredient != 'DONE':
        print "what is the ingredient?  no measurements yet, please.  type DONE"
        print "in all-caps if no more."
        ingredient = raw_input("> ")
        if ingredient == 'DONE':
            ingred_check()
        else:
            ingredients.append(ingredient)

And there are plenty of problems I haven’t solved yet. Will write more soon! Unemployed coding is fun, ha ha! “Hmm, let me chew on this juuuust a bit more… oh my god how did 3pm get here” etc etc : )

Aspirations toward Gittry

Over the last month, we’ve been working hard to finish up the coding and environment for, and finally the filming of, a series of tutorial videos. It’s something we’ve been working on at my job since, solidly, May, and but for a few release-based loose ends (“will our requirements.txt file really work with pip? why isn’t it working over … THERE?” etc etc), the project is over, and my contract is coming to a close. So I have a few projects I’d like to work on, AND NATURALLY, document for you!

First, let me point you to my website, which I have hugely upgraded. I’ve got a style sheet which I first applied just to the main page, then I applied it to the resume which I also updated, a bit, though it’s difficult since each position I apply for has a subtly different set of information.
therachelkelly.com
Regardless, I’m proud of the small, attractive changes I’ve made. Next up is to get a handle on some bootstrap and cherry-pick pieces of it, like the nav bar and a few other nice ideas.

Next, I’d like to run through another codecademy class, maybe the advanced web design one, but what’s more likely is the API-manipulation course. At some point soon I’d like to begin a project where I get a couple of the open APIs out there to talk to each other. My intention is not to re-invent the wheel, but to get a look at its inner workings myself!

I’m also about 60 pages through Jon Loeliger and Matthew McCullough’s Version Control with Git, 2nd ed, which is only about a year old, so quite up to date. As I’ve said, I want to be a Git wizard, and to earn that pointy, star-covered hat, it’s time to take a deep dive. It’s extremely exciting to me that I can read this book – when he (it seems like it’s mostly Loeliger’s game) says “The first number, 100644, represents the file attributes of the object… [and] should be familiar to anyone who has used the Unix chmod command.” which I am! I am familiar with chmod, Unix, and so much more relating to this topic! Wow! This is not to say that chmod is a particularly difficult concept, but that it is NOT a terribly entry-level topic either – I am rather beyond entry-level knowledge for many topics, and that is enormously gratifying.

brief aside: chmod refers to the the command which determines the level of permissions of a given file or directory. go here for more information. want to write more on this in the future, because I still haven’t found a super terse explanation.

So this Git book is great. They’ve already referenced someone that I KNOW, so that’s charming and a bit surreal. I suppose living in (the extremely small town of) Portland and being as active in the communit(y/ies) as I am, it’s bound to happen that I’ll meet or already know some People. But on to it – the book practically begins with SHA1 numbers, the hash number that Git assigns to a unique commit. Did you know that if your file is named yourfile and it says the same thing that my file, also called yourfile, says, then the SHA1 will be identical? WILD. Mind = blown. Apparently there is (very infrequently) a concern of “collision,” or two different kinds of commits yielding the same hash, but as the SHA1 has approximately 2^160 permutations (pretty sure I can’t use that word here?), that’s pretty unlikely.

So for now, the plan is to write about whatever I’m learning in the Git book, because the Git book is awesome. SEE YOU NEXT TIME!

Objects in Javascript

In Javascript, there are many ways, it seems, to create, instantiate, and edit objects. As part of my ongoing (noble) quest to make clear these curious structures, I want to create a resource for myself (and friends!) for how to manipulate objects in Javascript. Then I want to go back and compare how Python handles objects & what you can and can’t do with either language. MASTERY!

Ways to Make Objects

1

var rachelsObjectLiteral {
    objectColor: "red",
    objectSize: "friggin' huge",
    rachelsMethod: function (parameterToCall) {
        console.log("this is a 'hidden' function or method of the object
        rachelsObjectLiteral, calling " + parameterToCall + ".  the way to 
        call this Method is only via the object name, so 
        'rachelsObjectLiteral.rachelsMethod(argumentToCall)");
    },
    var rachelsOtherMethodMadePlain = function () {
        console.log("and this one you can just call outside the object
        without needing to reference rachelsObjectLiteral.  sounds like
        python's global.");
    }
};

rachelsObjectLiteral["objectHappiness"] = "really happy"

So as the object name announces, this is the Object Literal way to object creation. All of these things can be accessed via rachelsObjectLiteral.attribute, for example rachelsObjectLiteral.objectColor would refer to “red.” And a method is a function inside of an object. It’s hidden because you can’t call rachelsMethod without the object name. Also note that in an object literal construction, it’s COMMAS that go after each attribute (but not the final one), not semicolons.

And also note that I can add an attribute super easily here, e.g. "objecthappiness".

2

function objectConstructor (objectAttribute1, objectAttribute2) {
    this.objectAttribute1 = objectAttribute1;  # as someone helped me with this is comparable
    this.objectAttribute2 = objectAttribute2;  # to python's self.attributeName = attributeName
    this.objectMethod = function(parameter) {
        return parameter;
    };
}

var constructee = new objectConstructor (27, "floppy");

I really like this method of object creation. Name the superstructure, give it the attributes its constructed objects will eventually have, and then make a var as a new version of that superstructure. It’s just so easy to construct objects once you’ve created the structure!

Next we’ve got what seems to be a sort of pared down version of the second method, an object which at first has no attributes and whose attributes are assigned with keys, one by one. This second type of Constructor-style reminds me a lot of Pythonic dicts:

3

var newThing = new Object();
newThing["attribute1"] = "happy go shiny";
newThing["attribute2"] = "here's the second one!";

A really small version of the method three is var objectName = {}; and attributes can be assigned in the same way, or with dot notation, à la objectName.attribute3 = "hooray!";.

Finally, we’ve got the prototype of objects. Once an object’s been created, if you want to add more attributes you can do as we did in example 1, AND you can use prototype like so!

function Task (taskName) {
    this.taskName = taskName;
};

var coding = new Task("writing Python");

Task.prototype.checkOver = function() {
    return "you did it right, right?";
};

coding.checkOver();

var cleaning = new Task("tidying");

cleaning.checkOver();

Prototyping is probably the most challenging piece of this language for me, and along with that, it’s likely one of the most powerful. Ok! I will be coming back to this post probably constantly, hopefully you find it useful too!

Bananalogies in Javascryptography

Have you all read Douglas Hofstadter’s beautiful Gödel, Escher, Bach: An Eternal Golden Braid? You should go get your copy. If you don’t have one yet, you can take one home for your very self here. I’ll wait. The internet always waits.

Ok! Remember the terrific inter-chapter dialogues between the Tortoise and Achilles? Remember the one about pushing and popping, meta-Genies, and the Majotaur, “Little Harmonic Labyrinth”? Page 103 in the 20th Anniversary edition. Hofstadter was something of a computer scientist (while being rather disinterested in programming itself), so it’s no surprise that the mathematics of this dialogue (and indeed of the entirety of the delightfully dense GEB) read like a computational theory problem wrapped up in a Lewis Carroll witticism (whom Hofstadter adores and references frequently in the book).

I’m getting lost in the book, as I so often do : ) but my point here, other than urging you to GO! GO! READ THIS BOOK! IT’S HARD AND THAT’S OK! is that javascript’s class inheritance reminds me just a bit of this airy idea of pushing and popping from world to world. Each class is its own world, and pushing from that class is another class that can only come from the initial one.

function Feline = (name, type) {
    this.name = name;
    this.type = type;
};

Now let’s add a method to this class:

Feline.prototype.infoPrint = function() {
    for (var i in Feline) {
        console.log(Feline.i);
    }
};

And now, let’s make a new thing altogether. Notice the third attribute:

function DSH = (name, type) {
    this.name = name;
    this.type = type;
    this.color = color;

And now! Since we know that Domestic Short Haired cats are a kind of Feline, let’s make it so officially, and actually CREATE an animal out of this!!

DSH.prototype = new Feline();

var morris = new DSH("Morris", "ornery", "buff and white");

Also notice that only objects created from constructor DSH will have the attribute color, but the regular Feline class will not. DSH is a push down from Feline, and divining objects from the constructor DSH will only give us specific DSHs, which have all the characteristics of Feline as well (though I believe those are specially mutable even after you’ve defined them, but more on that later, when I understand better too [which I am pretty sure can be strung into the metaphor of popping, perhaps?!] : ))!

So, go ye, and read of Gödel, Escher, Bach: An Eternal Golden Braid and tell me what beautiful mathematic or programmatic relation he makes you think of, and, likely, consider in a whole new way!

Last thing: once, on the train (a multi-day, cross-country trip), I had that book in my hand, waiting to get a morning coffee so I could sit and read it (I’ve still only read up to page ~130), and a gal came up to me and said “I read that book thirty years ago, and I’ve been reading it ever since.” Still the finest commendation for a book that I’ve ever heard.

Rabbit object constructor with nested function

EDIT: no longer private, because the notes are good and I thought back to them this morning, so, good enough for me! This is from Codecademy Introduction to Objects 1 25/33.
Private because a) it’s not my code and b) there’s no commentary but it’s important enough to log

function Rabbit(adjective) {
    this.adjective = adjective;
    this.describeMyself = function() {
        console.log("I am a " + this.adjective + " rabbit!");
    };
}

// now we can easily make all of our rabbits

var rabbit1 = new Rabbit("fluffy");
var rabbit2 = new Rabbit("happy");
var rabbit3 = new Rabbit("sleepy");

rabbit1.describeMyself(); // called with constructed object, NOT constructor name.
rabbit2.describeMyself(); // constructedObject.internalMethod
rabbit3.describeMyself(); // output: "I am a sleepy rabbit!"

More JS Hobgobjects

Oh, wow, javascript object constructors. Cooooooooooool. Let’s dive right in, shall we?

function Expenses(AP,dollarsOut,frequency) {
    this.AP = AP;
    this.dollarsOut = dollarsOut;
    this.frequency = frequency;
    this.goodExpense = "maybe?";
};

var phone = new Expenses("Sprint Cellphone Bill", 160, "monthly")
var restaurants = new Expenses("Restaurant food out", 300, "monthly")

console.log("You spend " + restaurants.dollarsOut + " on " + restaurants.AP + ".")
console.log("Is " + phone.AP + " a good expense? Answer: " + phone.goodExpense)

Output:

You spend 300 on Restaurant food out.
Is Sprint Cellphone Bill a good expense? Answer: maybe?

To unpack this a bit, the constructor Expenses up there is defined up top with three attributes, which then makes the template creation of objects a SNAP. So phone and restaurants are whip-fast created. I can even make an attribute, like this.goodExpense, that’s not part of the callable constructor, but which every object created from it retains that defined attribute! AHHHH THAT IS SO COOL flail

And I can just access the attributes of these objects this easily! Seems magical. The this requirement of objects in JS is a little more approachable. Sorry for the flurry of posts – I just really, really want to get this course done, AND OBJECTS COMPLETELY UNDERSTOOD, so that I can move onto my next project which I am so so so excited for : )