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API Documentation
Version 1.19.5 and Older
Version 1.19.5 and Older
  • DecisionRules Documentation
  • API
    • API Introduction
    • API Keys
      • Solver API Keys
      • Management API keys
      • BI API keys
    • Rule Solver API
    • Management API
      • Deprecated Endpoints
    • Console Logs API
    • Business Intelligence API
      • Deprecated Endpoints
    • Datacenters & Locations
      • Global Cloud
      • Regional Cloud
    • Apache Kafka Solver API
    • Endpoint Settings
    • Archive
      • Rule Flow Solver API (DEPRECATED)
  • Decision tables
    • Decision Tables Introduction
    • Table Designer
    • Input & Output JSON Model
      • Simple Editor
      • JSON Editor
      • Binding to Model
    • Supported Data Types
    • Operators and Functions
      • Basic operators
      • Date operators
      • Functions
        • Logical Functions
        • Math Functions
        • Date and Time Functions
        • Text Functions
        • Data Functions
        • Array Functions
        • Integration functions
        • Functions and JSON
    • Export & Import of Decision Tables
      • Export Decision Table
      • Import Decision Table
      • File Structure of JSON Format
      • Managing Decision Table in Excel/Google Sheets
      • Deprecated Formats: XLSX v.1 and CSV
    • Table Operations
      • Filter Values
      • Valid Values
      • Sorting
  • Decision Trees
    • Decision Trees Introduction
    • Decision Tree Designer
    • Export & Import Decision Trees
      • Export Decision Tree
      • Import Decision Tree
  • Scripting Rules
    • Scripting Rule Introduction
    • Custom functions in Scripting Rules
    • Calling external API within ScriptingRules
    • Use Rule Variables in Scripting Rules
    • Call Embedded Rules in Scripting Rules
    • Export & Import Scripting Rules
      • Export Scripting Rule
      • Import Scripting Rule
    • Tips
  • Rule Flow
    • Rule Flow Designer
    • Rule Flow Mapping
    • Rule States in Rule Flow
    • Warnings & Errors
    • Rule Flow Limits
    • Export & Import Rule Flows
      • Export Rule Flow
      • Import Rule Flow
  • Workflow
    • Workflow Introduction
    • Workflow Designer
    • Workflow Nodes Overview
    • Workflow Limits
  • Other
    • Rule Alias
    • Execution Strategy
    • Rule State
    • Rule Versioning
    • Favorite Rules
    • Rule Variables
    • Rule Comparison
      • Decision Table Comparison
      • Decision Tree Comparison
      • Scripting Rule Comparison
    • Rule Tags
    • Rule Dependencies
    • Test Bench
    • Single Sign-On (SSO)
    • Event timeline
    • Rule Lock
    • Rule Migration Strategies
    • Changes in Version 1.19.0 (10/2024)
  • Organizations
    • Introduction
      • Access to Organization
    • Structure
      • Organization Roles
      • Members
      • Teams
      • Spaces
      • Space Roles
      • Policies
      • Settings
  • Teamwork
    • Dashboard
    • Folders
    • Spaces
    • Manage Spaces
    • Share Rules Between Spaces
    • Users & Roles
    • Teamwork Indicator
  • SDK and Integrations
    • Languages / Frameworks
      • SQL Server
      • Oracle PL/SQL
      • PostgreSQL
      • JavaScript
      • Java Spring Example
      • PHP Library
      • Python Library
      • .NET Library
      • Google Tag Manager
    • Excel Add-in
  • Business Intelligence
    • Audit Logs
    • Create a Power BI Report
    • Connect Power BI to Business Intelligence API
    • Connecting from Power BI (deprecated)
    • Connect DecisionRules to Power BI Using Our Custom Connector
  • Billing
    • Invoices & Billing
    • Change Product Plan
    • Billing Information
    • Plan Limits Explained
  • Regional Cloud
    • Regional Cloud
    • Region Specific API URLs
  • On-Premise / Docker
    • Environment Variables
    • Redis Connection Modes
    • Setup Single Sign-On (SSO)
      • Set up Microsoft Entra ID SSO
      • Set up Google SSO
    • DecisionRules Application
      • Minimal Requirements
      • DecisionRules Server
      • DecisionRules Client
      • DecisionRules Business Intelligence
      • Networking Between Docker Containers
    • Docker Showcase App
      • Showcase
      • Showcase + Business Intelligence
    • AWS Setup
      • AWS ECS/Fargate
      • Cache - Amazon ElastiCache
    • Microsoft Azure Setup
      • Database - Azure CosmosDB
      • Cache - Azure Cache for Redis
      • Azure Container Apps
    • Azure Red Hat OpenShift
    • Google Kubernetes Engine (GKE)
    • Kubernetes Setup
      • Kubernetes Setup with Business Intelligence
    • Logging options
    • CD/CI Pipelines
      • Azure DevOps CICD Pipelines
      • Using Migration script (old way)
    • Offline License
  • Terms & Conditions
    • Terms and Conditions
    • Privacy Policy
    • Service Level Agreement
      • Community Support
      • Standard Cloud (SaaS)
      • Silver SLA
      • Gold SLA
      • Custom SLA
    • Sub-Processor List
  • Roadmap 🚲 🗺️
  • Release Notes
    • Public Cloud
    • On-Premise / Private Cloud
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  1. Scripting Rules

Custom functions in Scripting Rules

In Scripting Rules, you can use functions as standard in JavaScript. The definition of the function must be before calling it.

Without methods of class DR

const CONSTANT = 20;

function fce(parameter){
    return parameter + 10;
}

output.result = fce(CONSTANT);
return output;

If you use methods of the DR class in a custom function, then the function must be asynchronous. Indicated by the key call to async and the call to the await function. DR class methods are automatically set to await, but you can specify it there yourself to make the code clearer for you.

Without await for methods of class DR

const CONSTANT = 20;

async function fce(parameter){
    const result = DR.solve("ruleId", {});
    return result + parameter;
}

output.result = await fce(CONSTANT);
return output;

With await for methods of class DR

const CONSTANT = 20;

async function fce(parameter){
    const result = await DR.solve("ruleId", {});
    return result + parameter;
}

output.result = await fce(CONSTANT);
return output;

Using custom functions to make parallel API calls

In the example below we first get an array of item names, we then define a function to make the asynchronous API call to a given item's name endpoint. After that we push all of the item calls into an empty array, which we use Promise.all on, giving us an array of results.

const url = "https://interestingApi.com"
const promises = [];

// get a list of itemNames from the API
const inventory = DR.http.get(url, options)

// define a function to make the API call
async function getDataForEachItem(itemName) {
    return await DR.http.get(url+itemName, options);
}

// push all of the function calls into an Array of promises
for (const item of inventory.itemsList) {
    promises.push(getDataForEachItem(item.name));
}

// call Promise.all on the array
output.output = await Promise.all(promises);

return output;

You can also use this pattern with DR.Solve() to call the DecisionRules Solver for many rules at once. This approach can however overburden the server and result in errors when making too many calls to the Solver at once.

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