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Redux, reducer
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| 'use strict'; | |
| console.clear(); | |
| var counter = function counter(state, action) { | |
| if (state === undefined) state = 0; | |
| 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: 'INCREMENT' })); | |
| expect(counter(undefined, {})).toEqual(0); | |
| console.log('Tests passed!'); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/expect/1.20.2/expect.min.js"></script> | |
| <script id="jsbin-source-javascript" type="text/javascript">'use strict'; | |
| console.clear(); | |
| 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: 'INCREMENT' }) | |
| ); | |
| expect( | |
| counter(undefined, {}) | |
| ).toEqual(0); | |
| console.log('Tests passed!'); | |
| </script> | |
| </body> | |
| </html> |
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