Representing logic as data in JSON

Question

For business reasons we need to externalize some conditional logic into external files: preferably JSON.

A simple filter-by scenario could be handled by adding a node a

Answer 1

I just wanted to help by defining a parsing logic in JavaScript for the JSON structure mentioned in the answer: https://stackoverflow.com/a/53215240/6908656

This would be helpful for people having a tough time in writing a parsing logic for this.

evaluateBooleanArray = (arr, evaluated = true) => {
    if (arr.length === 0) return evaluated;
    else if (typeof arr[0] === "object" && !Array.isArray(arr[0])) {
      let newEvaluated = checkForCondition(arr[0]);
      return evaluateBooleanArray(arr.splice(1), newEvaluated);
    } else if (typeof arr[0] === "string" && arr[0].toLowerCase() === "or") {
      return evaluated || evaluateBooleanArray(arr.splice(1), evaluated);
    } else if (typeof arr[0] === "string" && arr[0].toLowerCase() === "and") {
      return evaluated && evaluateBooleanArray(arr.splice(1), evaluated);
    } else if (Array.isArray(arr[0])) {
      let arrToValuate = [].concat(arr[0]);
      return evaluateBooleanArray(
        arr.splice(1),
        evaluateBooleanArray(arrToValuate, evaluated) 
      );
    } else {
      throw new Error("Invalid Expression in Conditions");
    }
  };

So the param arr here would be an array of conditions defined in the format as described by the attached link.