Rules Engine Coding Challenge

Your Task

Implement execute() in src/rules.ts to satisfy all the test cases in src/rules.test.ts.

The function should take a rule object and a facts object, and return a boolean indicating whether the facts satisfy the rule.

Rule Types

There are three types of rules:

1. Condition Rule: A simple rule that compares a value from the facts with a specified value using an operator.
2. All Rule: A rule that returns true only if all of its child rules are true (logical AND).
3. Any Rule: A rule that returns true if any of its child rules are true (logical OR).

Examples

Simple Condition Rule

const rule = {
  type: "condition",
  path: "age",
  operator: "gte", // greater than or equal
  value: 18,
};

const facts = {
  age: 21,
};

// Should return true because 21 >= 18
execute(rule, facts);

Nested Path Access

const rule = {
  type: "condition",
  path: "user.profile.age",
  operator: "gte",
  value: 18,
};

const facts = {
  user: {
    profile: {
      age: 21,
    },
  },
};

// Should return true
execute(rule, facts);

Logical AND (All)

const rule = {
  type: "all",
  all: [
    { type: "condition", path: "age", operator: "gte", value: 18 },
    { type: "condition", path: "hasConsent", operator: "eq", value: true },
  ],
};

const facts = {
  age: 21,
  hasConsent: true,
};

// Should return true because both conditions are true
execute(rule, facts);

Logical OR (Any)

const rule = {
  type: "any",
  any: [
    { type: "condition", path: "isMember", operator: "eq", value: true },
    { type: "condition", path: "isAdmin", operator: "eq", value: true },
  ],
};

const facts = {
  isMember: false,
  isAdmin: true,
};

// Should return true because at least one condition is true
execute(rule, facts);

Available Operators

• eq: Equal to
• notEq: Not equal to
• gt: Greater than
• gte: Greater than or equal to
• lt: Less than
• lte: Less than or equal to
• in: Value is in an array
• notIn: Value is not in an array

Good luck!