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Added operations to the readme #59

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Added operations to the readme #59

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577bf4f
Added operations to the readme
westlakem Sep 26, 2018
9424383
Use westlakem's idea for add_operation examples
jwadhams Jan 10, 2022
df6a992
Oops, whitespace
jwadhams Jan 10, 2022
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18 changes: 18 additions & 0 deletions README.md
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Expand Up @@ -130,4 +130,22 @@ If you want to use JsonLogic *and* support deprecated browsers, you could easily

It's not possible to include everyone's excellent ideas without the core library bloating, bringing in a ton of outside dependencies, or occasionally causing use case conflicts (some people need to safely execute untrusted rules, some people need to change outside state).

You can perform custom operations on your dataset using `add_operation`

```js
function lessThanNumber(age) {
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The name lessThanNumber suggests to me that the operation would let you pick which number it is less than. Really this is lessThan65.

return age < 65;
}

function greatherThanNumber(age) {
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This is misleading. greatherThanNumber is actually greaterThanOrEqualToNumber.

return age >= 65;
}

jsonLogic.add_operation('greatherThanNumber', greatherThanNumber);
jsonLogic.add_operation('lessThanNumber', lessThanNumber);

jsonLogic.apply({"greatherThanNumber":[{"var":"age"}]}, {"age":62}); // false
jsonLogic.apply({"lessThanNumber":[{"var":"age"}]}, {"age":62}); // true
```

Check out the [documentation for adding custom operations](http://jsonlogic.com/add_operation.html) and be sure to stop by the [Wiki page of custom operations](https://github.com/jwadhams/json-logic-js/wiki/Custom-Operations) to see if someone has already solved your problem or to share your solution.