More lenses 🕶 #316
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More lenses 🕶 #316
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stellarhoof
reviewed
Mar 4, 2020
| An include lens represents membership of a value in a set. It takes a value and lens and returns a new lens - kind of like a "writeable computed" from MobX or Knockout. The view and set functions allow you to read and write a boolean value for whether or not a value is in an array. If you change to true or false, it will set the underlying array lens with a new array either without the value or with it pushed at the end. | ||
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| #### optionLens | ||
| `value -> arrayLens -> optionLens` |
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This signature doesn't match the usage in the test: F.optionLens('a', 'selected', object)
Also shouldn't this be under domLens?
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it's not a dom lens, it's a higher-order lens - it belongs in the same category as includeLens, since it's the same kind of thing.
And yeah, you're right. I just copied the signature from includeLens, but I guess it's wrong for both 🤔
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(the difference, to clarify, is that the higher-order lenses includeLens and optionLens take a lens and return a lens, while the domLens methods take a lens and return an object mapping DOM properties to functions that manipulate the lens)
daedalus28
reviewed
Mar 5, 2020
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optionLens- a higher-order lens likeincludeLens, but for selection of mutually exclusive options instead of membership in a set (ie.optionLensis to radio lists asincludeLensis to checkbox lists)arrayLensstub (it seemed left out, since we have stubs for object and function lenses)