13 -- Lists+Dicts -- Sam Kauffman

[sak55]

Tasks

• [x] Yak Shaving (S)
  • Create your WIP Issue named 13 -- Lists + Dicts with tasks and estimates!
  • Merge your PR, update your local master, and open a new branch: feature/13--lists+dicts
  • Create a new file in apis/github/users/USERNAME/events.json where USERNAME is... you get it.
  • Use curl or Postman to fetch your public events from the Github API
  • Commit, push, and open a PR!
• [x] Take a Picture (M)
• [x] One More Time... (L)
  • [x] Checkpoint: String Calculator with if and return (no else)
  • [x] Checkpoint: Check Writing refactored to fromEnglish()
  • [x] Checkpoint: Check Writing refactored fromEnglish() to use at least one lookup!
  • [x] Checkpoint: Check Writing with 100% Array lookups instead of if
  • [x] Mission Complete
• [x] Reading JavaScript (XL)
  • [x] Checkpoint: Let's talk about forEach... a lot.
  • [x] Checkpoint: Here's that every() and some() crowd again.
  • [x] Checkpoint: Who needs a filter() anyway?
  • [x] Checkpoint: Can I get a map() over here?
  • [x] Checkpoint: I wish I could reduce() this assignment...
  • [x] Checkpoint: Am I reduceRight()...?
  • [x] Mission Complete!
• [ ] API Gymnastics (L)
  • [x] Checkpoint: Got me some data...
  • [x] Checkpoint: Count it up right...
  • [x] Checkpoint: Filtering out just the PushEvent entries...
  • [ ] Checkpoint: Now doing the complete opposite...
  • [ ] Checkpoint: I have all the answers now!
  • [ ] Mission Complete

[sak55]

my PR https://github.com/sak55/TIY-Assignments/pull/17

[sak55]

13 -- Of Lists and Dictionaries

Description

try out our new Array and Object literals on those mean ole String Calculator and Check Writing katas. Before Take a Picture of your logic for practice. You'll need to learn some more Array methods before we prep the floor for some API Gymnastics.

Take a Picture

Using a diagramming tool of your choice -- Google Drawings, Gliphy, OmniGraffle, photos of pen and paper -- render a clean drawing of the logic in the toEnglish function from Check Writing. Save a copy of the resultant image as docs/toEnglish.png and commit it into your branch.

One More Time...

Think you've mastered the String Calculator and Check Writing katas? Not by a long-shot...! Refactor your "production" (i.e. not-"test") code to use Array and Object literals as Lists and Dictionaries per the examples below.

Reading JavaScript: Array Iterators

Highly recommended BEFORE API Gymnastics, document the non-experimental Array Iteration Methods and attempt to re-implement at least 3 using Array.prototype.forEach. BEAST MODE: Also include find and findIndex. See Requirements below for an example of every().

API Gymnastics: Floor Routines

Use the curl command to get some crazy event data from the Github API and stick it in a file called apis/github/users/USERNAME/events.json where USERNAME is your Github profile name, e.g. apis/github/users/al-the-x/events.json for moi: al-the-x. Yes, you'll have to create some empty directories along the way... Remember how to do it in one step? Hint: Use the funnel, Luke! Following the Requirements below, use your iterator methods to pull some numbers from the data.

Deliverables

• PR in:
  • diagram of toEnglish() from scripts/check-writing.js in docs/toEnglish.png
  • more documentation in docs/JS.md for non-experimental Iteration Methods
  • new file in scripts/ called gymnastics.js with a function called answers that meets

Format for Reading JavaScript

---

Literal: Array

. . .

Iterator Methods

Array.prototype.every

• params:
  • callback: Function to test each element against
  • params:
    • item: element to process
    • index: index of processed element
    • all: array instance
  • returns: Boolean
  • thisArg: Object to which to bind callback
• returns: Boolean whether callback returns true for every element
• example:

function every(anArray, callback){
  var hasFailed = false; // it hasn't has it?

  // iterate...
  anArray.foreach(function(item, index, all){
    if ( hasFailed ) return; // one failure ruins everything...

    hasFailed = !callback(item, index, all); // why invert here?
  });

  return !hasFailed; // Another inverse?
  // What if `anArray` is empty?
}

---

API Gymnastics

Next, use the methods of Array that you've documented to uncover some statistics about your progress. You can create as many functions as you like to help you derive the answers, but place the final invocations (not just the values) into a function called answers that returns the following:

[LoganArnett]

Looking for those :+1: on that PR