### Evaluate JsonLogic Expression in Java

Source: https://github.com/jamsesso/json-logic-java/blob/main/README.md

Instantiate JsonLogic, set up a JSON expression and data map, then apply the expression to evaluate the result. The JsonLogic instance is thread-safe.

```java
// Create a new JsonLogic instance. JsonLogic is thread safe.
JsonLogic jsonLogic = new JsonLogic();

// Set up some JSON and some data.
String expression = "{\"*": [{\"var\": \"x\"}, 2]}";
Map<String, Integer> data = new HashMap<>();
data.put("x", 10);

// Evaluate the result.
double result = (double) jsonLogic.apply(expression, data);
assert result == 20.0;
```

--------------------------------

### Add json-logic-java Dependency

Source: https://github.com/jamsesso/json-logic-java/blob/main/README.md

Include this XML snippet in your Maven project's pom.xml to add the json-logic-java dependency.

```xml
<dependency>
  <groupId>io.github.jamsesso</groupId>
  <artifactId>json-logic-java</artifactId>
  <version>1.1.0</version>
</dependency>
```

--------------------------------

### Check Truthiness with Javascript Rules

Source: https://github.com/jamsesso/json-logic-java/blob/main/README.md

Use the static truthy method to mimic Javascript's truthiness rules for various data types. This is useful for consistent logic evaluation across different environments.

```java
assert JsonLogic.truthy(0) == false;
assert JsonLogic.truthy(1) == true;
assert JsonLogic.truthy("") == false;
assert JsonLogic.truthy("Hello world!") == true;

// etc...
```

--------------------------------

### Add Custom Operation to JsonLogic

Source: https://github.com/jamsesso/json-logic-java/blob/main/README.md

Register a custom operation with the JsonLogic instance using addOperation. The provided lambda function will be executed when the custom operation is encountered in an expression.

```java
// Register an operation.
jsonLogic.addOperation("greet", (args) -> "Hello, " + args[0] + "!");

// Evaluate the result.
String result = (String) jsonLogic.apply("{\"greet\": [\"Sam\"]}", null);
assert "Hello, Sam!".equals(result);
```

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