@gisce/conscheck
v1.0.11
Published
A JavaScript library for evaluating JSON-based conditions. It allows complex conditional logic to be defined and interpreted from JSON structures, enabling dynamic decision-making in applications.
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@gisce/conscheck
@gisce/conscheck
is a versatile TypeScript library for evaluating JSON-based conditions in JavaScript. It allows the definition of complex conditional logic to be interpreted from JSON structures, enabling dynamic and flexible decision-making within applications.
Features
- Evaluate conditions defined in JSON format.
- Support for both simple and nested conditions.
- Operators include '=', '>=', '<=', '>', '<', and '!='.
- Compatible with both client-side and server-side JavaScript.
Installation
To install the library, use npm:
npm install @gisce/conscheck
Usage
Here is a basic example of how to use @gisce/conscheck
:
import { evaluateCondition } from "@gisce/conscheck";
const condition = {
condition: "AND",
rules: [
{
field: "age",
operator: ">=",
value: 18,
},
{
field: "citizenship",
operator: "=",
value: true,
},
],
};
const object = { age: 20, citizenship: true };
const result = evaluateCondition({ object, condition });
console.log(result); // Output: true
Nested Conditions
@gisce/conscheck
also supports nested conditions. Here's an example:
const nestedCondition = {
condition: "OR",
rules: [
{
condition: "AND",
rules: [
{
field: "age",
operator: ">=",
value: 65,
},
{
field: "retired",
operator: "=",
value: true,
},
],
},
{
field: "age",
operator: "<",
value: 18,
},
],
};
const object = { age: 70, retired: true };
const nestedResult = evaluateCondition({ object, condition: nestedCondition });
console.log(nestedResult); // Output: true
Optional evaluateFieldComparison
Function
You can pass a function to evaluateCondition
to modify the default field comparison behaviour. This function will be called for each field comparison in the condition, and has the following signature:
function evaluateFieldComparison({
fieldName,
valueInObject,
expectedValue,
}: FieldComparisonParams): FieldComparisonResult;
The function should return a FieldComparisonResult
object, which has the following structure:
interface FieldComparisonResult {
modifiedValueInObject?: any;
modifiedExpectedValue?: any;
directOutcome?: boolean;
}
Contributing
Contributions to @gisce/conscheck
are welcome. Please feel free to submit pull requests or open issues to improve the library.
License
This project is licensed under the MIT License - see the LICENSE file for details.