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February 4, 2017 00:44
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| const createType = name => { | |
| const of = x => Object.freeze({ | |
| '@@type': name, | |
| fold: f => f(x), | |
| map: f => of(f(x)), | |
| inspect: () => `${name}(${x})` | |
| }) | |
| return {of} | |
| } | |
| const Left = createType('Left') | |
| const x = {a: 1} | |
| Left.of(x).map(({a}) => a + 1) |
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