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JS Bin // source https://jsbin.com/basacipojo
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| <script src="https://wzrd.in/standalone/expect@latest"></script> | |
| </head> | |
| <body> | |
| <script id="jsbin-javascript"> | |
| /* | |
| * Open the console tab | |
| * to see that the tests pass. | |
| */ | |
| // Reducer Function | |
| // State Default 0 | |
| // Take in State & Action & Return | |
| 'use strict'; | |
| 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; | |
| } | |
| }; | |
| // State = 1 | |
| expect(counter(0, { type: 'INCREMENT' })).toEqual(1); | |
| // State = 2 | |
| expect(counter(1, { type: 'INCREMENT' })).toEqual(2); | |
| // State = 1 | |
| expect(counter(2, { type: 'DECREMENT' })).toEqual(1); | |
| // State = 0 | |
| expect(counter(1, { type: 'DECREMENT' })).toEqual(0); | |
| // State = 1 | |
| expect(counter(1, { type: 'SOMETHING_ELSE' })).toEqual(1); | |
| // State = 0 | |
| expect(counter(undefined, {})).toEqual(0); | |
| console.log('Tests passed!'); | |
| </script> | |
| <script id="jsbin-source-javascript" type="text/javascript">/* | |
| * Open the console tab | |
| * to see that the tests pass. | |
| */ | |
| // Reducer Function | |
| // State Default 0 | |
| // Take in State & Action & Return | |
| const counter = (state = 0, action) => { | |
| switch (action.type) { | |
| case 'INCREMENT': | |
| return state + 1; | |
| case 'DECREMENT': | |
| return state - 1; | |
| default: | |
| return state; | |
| } | |
| } | |
| // State = 1 | |
| expect( | |
| counter(0, { type: 'INCREMENT' }) | |
| ).toEqual(1); | |
| // State = 2 | |
| expect( | |
| counter(1, { type: 'INCREMENT' }) | |
| ).toEqual(2); | |
| // State = 1 | |
| expect( | |
| counter(2, { type: 'DECREMENT' }) | |
| ).toEqual(1); | |
| // State = 0 | |
| expect( | |
| counter(1, { type: 'DECREMENT' }) | |
| ).toEqual(0); | |
| // State = 1 | |
| expect( | |
| counter(1, { type: 'SOMETHING_ELSE' }) | |
| ).toEqual(1); | |
| // State = 0 | |
| expect( | |
| counter(undefined, {}) | |
| ).toEqual(0); | |
| console.log('Tests passed!');</script></body> | |
| </html> |
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Learn more about bidirectional Unicode characters
| /* | |
| * Open the console tab | |
| * to see that the tests pass. | |
| */ | |
| // Reducer Function | |
| // State Default 0 | |
| // Take in State & Action & Return | |
| 'use strict'; | |
| 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; | |
| } | |
| }; | |
| // State = 1 | |
| expect(counter(0, { type: 'INCREMENT' })).toEqual(1); | |
| // State = 2 | |
| expect(counter(1, { type: 'INCREMENT' })).toEqual(2); | |
| // State = 1 | |
| expect(counter(2, { type: 'DECREMENT' })).toEqual(1); | |
| // State = 0 | |
| expect(counter(1, { type: 'DECREMENT' })).toEqual(0); | |
| // State = 1 | |
| expect(counter(1, { type: 'SOMETHING_ELSE' })).toEqual(1); | |
| // State = 0 | |
| expect(counter(undefined, {})).toEqual(0); | |
| console.log('Tests passed!'); |
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