update vars -> const or let

Author: ShMcK

README.md

@@ -9,6 +9,9 @@ Keywords: javascript, functional
 Length: 1-2 hours
 
 
+<!-- @import('00/setup') -->
+<!-- @import('01/filter') -->
+<!-- @import('02/sort') -->
 <!-- @import('08/challenge-1') -->
 <!-- @import('09/challenge-2') -->
 
@@ -29,123 +32,6 @@ CodeRoad is an open-sourced interactive tutorial platform for the Atom Editor. L
 
 ## Outline
 
-##### Start
-
-Understanding the Data Set
-
-Over this tutorial series, we'll be changing and working with two different data sets. It'll be a big help to first understand what the data looks like.
-
-```json
-var students = [
-  {
-    "title": "Relational Databases",
-    "instructor": "Sean Quentin Lewis",
-    "name": "Ada Lovelace",
-    "score": 91,
-    "grade": "A"
-  },
-  ...
-]
-```
-
-Here we have an array of "student" objects. To get the first item in the array, you can use the array index. Array indexes start at 0.
-
-```js
-console.log(
-  'first instructor', students[0].instructor
-);
-// first instructor Sean Quentin Lewis
-```
-
-##### Filter
-
-Array -> Array of items that match a condition
-
-You've hacked into the school's computer system, and just in time. The grades are in, but you're not too proud of your performance. That's okay, you have a plan: you're going to create a fake report card.
-
-It would be great if you could `filter` the scores that your parents will see.
-
-`filter` takes a matching condition function and only returns items that result in true. As an example, look at `isA` below:
-
-```
-function isA(x) {
-  return x === 'a';
-}
-```
-
-
-Like all of the methods in this chapter, `filter` is already part of the `Array.prototype`, so you can run it following any array. Each item in the array is passed into the params of the condition function, one by one. [Learn more](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter).
-
-```
-var list = ['a', 'b'];
-list.filter(isA);
-
-// if isA(list[0]), add to output array
-// if isA(list[1]), add to output array
-//
-//> ['a']
-```
-
-If your data was composed of objects, we could use dot notation to find matches. Checkout `isB` below.
-
-```
-function isB(x) {
-  return x.item === 'b'
-}
-
-var list = [{item: 'a'}, {item: 'b'}];
-list.filter(isB);
-//> [{item: 'b'}]
-```
-
-Where were we? Back to filtering our grades.
-
-There's too much student data in the computer system. We'll have to sort through it. Have a look at an example below:
-
-```
-console.log(students[0]);
-//> { course: 'Web Security',
-//    instructor: 'Sue Denim',
-//    name: 'Rebecca Heineman',
-//    score: 93,
-//    grade: 'A' }
-```
-
-##### Sort
-
-Array -> sorted Array
-
-Your grades are filtered down to your name and good scores - but wouldn't it be better if your best grades were displayed first, at the top? Besides, your parents rarely read anything through.
-
-You can use the array method `sort` to arrange your data. Let's see how it works.
-
-```js
-['c', 'b', 'a'].sort();
-//> ['a', 'b', 'c']
-
-[3, 2, 1].sort();
-//> [1, 2, 3]
-```
-
-But what about sorting scores inside of an object?
-
-```js
-[{a: 3}, {a: 1}, {a: 2}].sort();
-//> [{a: 3}, {a: 1}, {a: 2}]
-```
-
-That didn't work. Instead, you can write a custom `compareScore` function.
-
-A sort function takes two params, and compares the first to the second. It should return values saying where the second value should go in the array:
-
-  * -1 : sort to a lower index (front)
-  * 1 : sort to a higher index (back)
-  * 0 : stay the same
-
-Alright, now time to sort your best grades to the top.
-
-First you'll need to write a sort condition function called `compareScore`.
-
 ##### Map
 
 Array -> run a function over each item -> Array

coderoad.json

@@ -1,6 +1,6 @@
 const setup = require('BASE/00-setup.js');
 
-describe('02 first', () => {
+describe('02 const first', () => {
 
 	// __get__ grabs global first
 	const first = setup.__get__('first');

tutorial/00/02.js

@@ -1,4 +1,4 @@
-describe('03 myName', () => {
+describe('03 const myName', () => {
 
   // __get__ grabs global myName
   const myName = setup.__get__('myName');

tutorial/00/03.js

@@ -7,7 +7,7 @@ describe('01 function isAda', () => {
   const isAda = filter.__get__('isAda');
 
   it('doesn\'t exist', () => {
-    expect(isAda).to.not.be.undefined;
+    expect(isAda).to.be.defined;
   });
 
   it('isn\'t a Function', () => {

tutorial/01/01.js

@@ -1,9 +1,9 @@
-describe('02 var myData', () => {
+describe('02 const myData', () => {
 
   const myData = filter.__get__('myData');
 
   it('doesn\'t exist', () => {
-    expect(myData).to.not.be.undefined;
+    expect(myData).to.be.defined;
   });
 
   it('doesn\'t output an array', () => {

tutorial/01/02.js

@@ -3,7 +3,7 @@ describe('03 function isGoodGrade', () => {
   const isGoodGrade = filter.__get__('isGoodGrade');
 
   it('doesn\'t exist', () => {
-    expect(isGoodGrade).to.not.be.undefined;
+    expect(isGoodGrade).to.be.defined;
   });
 
   it('isn\'t a Function', () => {

tutorial/01/03.js

@@ -1,9 +1,9 @@
-describe('04 var myBest', () => {
+describe('04 const myBest', () => {
 
   const myBest = filter.__get__('myBest');
 
   it('doesn\'t exist', () => {
-    expect(myBest).to.not.be.undefined;
+    expect(myBest).to.be.defined;
   });
 
   it('doesn\'t output an array', () => {

tutorial/01/04.js

@@ -17,7 +17,7 @@ function isA(x) {
 Like all of the methods in this chapter, `filter` is already part of the `Array.prototype`, so you can run it following any array. Each item in the array is passed into the params of the condition function, one by one. [Learn more](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter).
 
 ```
-var list = ['a', 'b'];
+const list = ['a', 'b'];
 list.filter(isA);
 
 // if isA(list[0]), add to output array
@@ -33,7 +33,7 @@ function isB(x) {
   return x.item === 'b'
 }
 
-var list = [{item: 'a'}, {item: 'b'}];
+const list = [{item: 'a'}, {item: 'b'}];
 list.filter(isB);
 //> [{item: 'b'}]
 ```
@@ -70,12 +70,12 @@ function isAda(student) {
 @hint('Check if `student.name` matches "Ada Lovelace"')
 @hint('Use `===` to check equality')
 
-+ Set `var myData` to filter with the `isAda` function.
++ Set `const myData` to filter with the `isAda` function.
 @test('01/02')
 @action(insert(
 ```
 // run the function name in filter
-var myData = students.filter(::>);
+const myData = students.filter(::>);
 ```
 ))
 @hint('Add a function to the `filter` call: `Array.filter(function() {})`')
@@ -97,13 +97,13 @@ function isGoodGrade(student) {
 @hint('use `!==` to check non-equality')
 @hint('Match for both: `student.grade !== "D" && student.grade !== "F"`')
 
-+ Set `var myBest` to your scores, excluding any grades that are "D" or "F".
++ Set `const myBest` to your scores, excluding any grades that are "D" or "F".
 
 @test('01/04')
 @action(insert(
 ```
 // filter out "D"'s and "F"'s here
-var myBest = myData.filter(::>);
+const myBest = myData.filter(::>);
 
 ```
 ))

tutorial/01/filter.md

@@ -4,7 +4,7 @@ const compareScore = sort.__get__('compareScore');
 describe('02 function compareScore', () => {
 
 	it('doesn\'t exist', () => {
-		expect(compareScore).to.not.be.undefined;
+		expect(compareScore).to.be.defined;
 	});
 
 	it('isn\'t a Function', () => {