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JS Bin// source https://jsbin.com/cocipo
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="https://npmcdn.com/expect/umd/expect.min.js"></script> | |
| <link href="http://extjs.cachefly.net/ext-3.1.0/resources/css/ext-all.css" rel="stylesheet" type="text/css" /> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <script id="jsbin-javascript"> | |
| 'use strict'; | |
| function counter(state, action) { | |
| if (action.type === 'INCREMENT') { | |
| return state + 1; | |
| } else if (action.type === 'DECREMENT') { | |
| return state - 1; | |
| } | |
| return state; | |
| } | |
| expect(counter(0, { type: 'INCREMENT' })).toEqual(1); | |
| expect(counter(1, { type: 'INCREMENT' })).toEqual(2); | |
| expect(counter(2, { type: 'DECREMENT' })).toEqual(1); | |
| expect(counter(1, { type: 'DECREMENT' })).toEqual(0); | |
| expect(counter(1, { type: 'SOMETHING_ELSE' })).toEqual(1); | |
| console.log('Tests passed!'); | |
| </script> | |
| <script id="jsbin-source-html" type="text/html"><!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="https://npmcdn.com/expect/umd/expect.min.js"><\/script> | |
| <link href="//extjs.cachefly.net/ext-3.1.0/resources/css/ext-all.css" rel="stylesheet" type="text/css" /> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| </body> | |
| </html></script> | |
| <script id="jsbin-source-javascript" type="text/javascript">function counter(state, action){ | |
| if(action.type === 'INCREMENT'){ | |
| return state + 1; | |
| } | |
| else if(action.type === 'DECREMENT'){ | |
| return state - 1; | |
| } | |
| return state; | |
| } | |
| expect( | |
| counter(0, { type: 'INCREMENT'}) | |
| ).toEqual(1); | |
| expect( | |
| counter(1, { type: 'INCREMENT'}) | |
| ).toEqual(2); | |
| expect( | |
| counter(2, { type: 'DECREMENT'}) | |
| ).toEqual(1); | |
| expect( | |
| counter(1, { type: 'DECREMENT'}) | |
| ).toEqual(0); | |
| expect( | |
| counter(1, { type: 'SOMETHING_ELSE'}) | |
| ).toEqual(1); | |
| console.log('Tests passed!'); | |
| </script></body> | |
| </html> |
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| const counter = (state = 0, action) => { | |
| switch (action.type){ | |
| case 'INCREMENT': | |
| return state + 1; | |
| case 'DECREMENT': | |
| return state - 1; | |
| default: | |
| return state; | |
| } | |
| } | |
| expect( | |
| counter(0, { type: 'INCREMENT'}) | |
| ).toEqual(1); | |
| expect( | |
| counter(1, { type: 'INCREMENT'}) | |
| ).toEqual(2); | |
| expect( | |
| counter(2, { type: 'DECREMENT'}) | |
| ).toEqual(1); | |
| expect( | |
| counter(1, { type: 'DECREMENT'}) | |
| ).toEqual(0); | |
| expect( | |
| counter(1, { type: 'SOMETHING_ELSE'}) | |
| ).toEqual(1); | |
| expect( | |
| counter(undefined, {}) | |
| ).toEqual(0); | |
| console.log('Tests passed!'); |
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es6 syntax