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Commitd010992

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Step 5 outline and tests complete
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8 files changed

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8 files changed

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‎README.md

Lines changed: 16 additions & 8 deletions
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@@ -5,7 +5,7 @@ A [CodeRoad](https://coderoad.github.io) tutorial for learning Redux.
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<!-- @import('01')-->
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<!-- @import('02')-->
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<!-- @import('03')-->
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<!-- @import('05')-->
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<!-- @import('04')-->
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<!-- @import('06')-->
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<!-- @import('07')-->
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<!-- @import('08')-->
@@ -28,13 +28,21 @@ CodeRoad is an open-sourced interactive tutorial platform for the Atom Editor. L
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##Outline
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#####Reducer
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#####Pure Functions
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33-
The data transformation
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Reducers must be pure functions
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State is "read only".
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Notes
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```js
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constreducer= (state)=> {
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console.log(state);
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return state;
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};
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```
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constnextPokemon=state.pokemon.map(p=> {
40+
if (id===p.id) {
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p.votes+=1;
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}
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return p;
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});
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return {
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pokemon: nextPokemon
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};
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```

‎coderoad.json

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@@ -1,63 +1,36 @@
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{
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"info": {
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"title":"CodeRoad Redux JS Tutorial",
4-
"description":"A [CodeRoad](https://coderoad.github.io) tutorial for learning Redux.\n\n<!-- @import('01') -->\n<!-- @import('02') -->\n<!-- @import('03') -->\n<!-- @import('05') -->\n<!-- @import('06') -->\n<!-- @import('07') -->\n<!-- @import('08') -->\n<!-- @import('09') -->"
4+
"description":"A [CodeRoad](https://coderoad.github.io) tutorial for learning Redux.\n\n<!-- @import('01') -->\n<!-- @import('02') -->\n<!-- @import('03') -->\n<!-- @import('04') -->\n<!-- @import('06') -->\n<!-- @import('07') -->\n<!-- @import('08') -->\n<!-- @import('09') -->"
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},
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"pages": [
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{
8-
"title":"Reducer",
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"description":"The data transformation\n\n```js\nconstreducer =(state) => {\nconsole.log(state);\n returnstate;\n};\n```",
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"title":"Pure Functions",
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"description":"Reducers must be pure functions\n\nState is\"read only\".\n\nNotes\n```js\nconstnextPokemon = state.pokemon.map(p => {\n if (id === p.id) {\n p.votes += 1;\n }\nreturnp;\n });\n return {\n pokemon: nextPokemon\n };\n```",
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"tasks": [
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{
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"description":"Extract the `state => state` function in create store, and call in a new function called\"reducer\".",
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"description":"Return a new list of Pokemon after incrementing\"votes\" of the pokemon with the matching\"id\"",
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"tests": [
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"04/01"
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],
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"actions": [
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"open('index.js')"
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]
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},
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{
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"description":"Log the state inside of your reducer. What does it look like?",
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"tests": [
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"04/02"
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],
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"hints": [
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"Add a `console.log` statement inside of your reducer function",
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"Try this:```js\nconst reducer = (state) => {\n console.log(state);\n return state;\n};\n```"
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]
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},
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{
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"description":"Pass an action as a second param to the reducer",
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"tests": [
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"04/03"
14+
"05/01"
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]
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},
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{
37-
"description":"Dispatch two voteUp actions through the reducer: `store.dispatch(voteUp(2))`. Change your log statement inside ofyourreducer to look like this: `console.log('state: ', state, 'action: ', action)`",
18+
"description":"Let's make a test to see that we are truly returning a new state. Wrapyour`initialState` object in a `Object.freeze`. Freeze makes an object unchangeable. And yet your reducer should still work.",
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"tests": [
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"04/04"
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"05/02"
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]
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},
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{
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"description":"Create a `switch` statement and pass in `action.type`,thedefault return shouldreturn`state`",
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"description":"What if we were dealing with multiple keys onthestate. We'd have to ensure that our changesreturna complete newstate each time. Use `Object.assign`",
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"tests": [
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"04/05"
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]
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},
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{
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"description":"The `switch` statement should have a `default` case that returns the state",
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"tests": [
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"04/06"
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]
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},
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{
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"description":"add a switch case for `VOTE_UP`. For now, just console.log the `id` of the action passed in and return the default state again.",
56-
"tests": [
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"04/07"
26+
"05/03"
27+
],
28+
"hints": [
29+
"return `Object.assign({}, { pokemon: nextPokemon });`"
5830
]
5931
}
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]
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],
33+
"onPageComplete":"Now that you have an idea of how reducers work. Next we can look at how to create multiple, modular reducers."
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}
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]
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}

‎tutorial/04/index.md

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@@ -36,5 +36,5 @@ const reducer = (state) => {
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+ The`switch` statement should have a`default` case that returns the state
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@test('04/06')
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+ add a switch case for`VOTE_UP`. For now, just console.log the`id` of the action passed in and return the default state again.
39+
+ add a switch case for`VOTE_UP`. For now, just console.log the`id` of the action passed in and return the default state again. Tip: destructuring:`const { id } = action.payload;`
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@test('04/07')

‎tutorial/05/01.js

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@@ -1,3 +1,30 @@
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describe('01 pure function',()=>{
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varexpect=require('chai').expect;
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/// load('index.js')
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describe('01 the pure reducer',()=>{
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consttestState={
8+
pokemon:[{
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id:99,
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votes:0,
11+
},{
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id:100,
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votes:0,
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},{
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id:101,
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votes:0,
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}]
18+
};
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20+
consttestAction=({type:'VOTE_UP',payload:{id:100}});
21+
22+
it('should have a reducer',()=>{
23+
expect(reducer).to.be.defined;
24+
})
25+
26+
it('should increment the votes matching the id only',()=>{
27+
expect(reducer(testState,testAction).pokemon[1].votes).to.equal(1);
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});
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});

‎tutorial/05/02.js

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describe('02 pure function',()=>{
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describe('02 initialState',()=>{
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it('should be frozen',()=>{
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expect(Object.isFrozen(initialState)).to.be.true;
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});
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});

‎tutorial/05/03.js

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@@ -0,0 +1,15 @@
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describe('03 uses Object.assign',()=>{
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it('to return the modified state',()=>{
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constregex=/Object.assign/;
5+
conststring=reducer.toString();
6+
expect(string).to.match(regex);
7+
});
8+
9+
it('to target an empty object',()=>{
10+
constregex=/Object.assign\(\{\}\,/;
11+
conststring=reducer.toString();
12+
expect(string).to.match(regex);
13+
});
14+
15+
});

‎tutorial/05/index.md

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,9 @@
1-
#Pure Functions
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##Pure Functions
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Reducers must be pure functions
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3-
05/01
4+
State is "read only".
5+
6+
Notes
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```js
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constnextPokemon=state.pokemon.map(p=> {
69
if (id===p.id) {
@@ -13,13 +16,14 @@ const nextPokemon = state.pokemon.map(p => {
1316
};
1417
```
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16-
+ Return a new list of Pokemonwith the pokemon matching theid incrementing its votes by one
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+ Return a new list of Pokemonafter incrementing "votes" of thepokemon with the matching "id"
1720
@test('05/01')
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19-
20-
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+ Use Object.assign
22+
+ Let's make a test to see that we are truly returning a new state. Call`Object.freeze()` on your`initialState`.`freeze` makes an object immutable - meaning the object can not be changed. And yet your reducer should still work, since it returns a new state each call.
2223
@test('05/02')
24+
25+
+ What if we were dealing with multiple keys on the state. We'd have to ensure that our changes return a complete new state each time. Use`Object.assign`
26+
@test('05/03')
2327
@hint('return`Object.assign({}, { pokemon: nextPokemon });`')
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25-
@onPageComplete('')
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@onPageComplete('Now that you have an idea of how reducers work. Next we can look at how to create multiple, modular reducers.')

‎tutorial/tutorial.md

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@@ -2,11 +2,11 @@
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A[CodeRoad](https://coderoad.github.io) tutorial for learning Redux.
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<!--@import('01')-->
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<!--@import('02')-->
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<!--@import('03')-->
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@import('01')
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@import('02')
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@import('03')
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@import('04')
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<!--@import('05')-->
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@import('05')
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<!-- @import('07')-->
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<!-- @import('08')-->

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