Use of (function executeRule(current, previous /null when async/)

imran rasheed · ‎01-07-2021

Can someone explain the purpose of below predefined function in business rules.

(function executeRule(current, previous /*null when async*/) {

// Add your code here

})(current, previous);

Ankur Bawiskar · ‎01-07-2021

@imran rasheed

It's one of the template of writing your code within BR

The Script field is pre-populated with that template.

The function syntax is known in JavaScript as a self-invoking function or an Immediately Invoked Function Expression (IIFE). The function is immediately invoked after it is defined. ServiceNow manages the function and when it is invoked; developers do not explicitly call Business Rule Scripts.

Business Rule Scripts

Sharing the common syntax

1) Method 1

(function executeRule(current, previous /*null when async*/) {

// Add your code here

})(current, previous);

2) Method 2 - Define your function and use your code

restrictIncidents();

function restrictIncidents() {

// your code here

}

Regards
Ankur

Regards,
Ankur
✨ Certified Technical Architect || ✨ 9x ServiceNow MVP || ✨ ServiceNow Community Leader

View solution in original post

Ankur Bawiskar · ‎01-07-2021

Hi,

those are the parameters to the self-invoked function

the current and previous objects will help to fetch the previous and current value from the record on which BR runs

Regards
Ankur

Regards,
Ankur
✨ Certified Technical Architect || ✨ 9x ServiceNow MVP || ✨ ServiceNow Community Leader

Andrew Bettcher · ‎10-11-2022

I found a question on a practice paper for the CAD exam.

Here is the Business Rule script template:

(function executeRule (current, previous */null when async*/){})(current,previous);

This type of JavaScript function is known as:

1. Constructor

2. Scoped

3. Anonymous

4. Self Invoking

I gave 4 as the answer but was advised that this was incorrect and that the answer is 2. Can anyone confirm either way please? @Ankur Bawiskar

Ankur Bawiskar · ‎10-11-2022

From my understanding it's option 4.

Regards,
Ankur
✨ Certified Technical Architect || ✨ 9x ServiceNow MVP || ✨ ServiceNow Community Leader

Andrew Bettcher · ‎10-11-2022

I'd imagine that, if that's what you think then it must be true.

Thank you again Ankur.

JithinPadma · ‎02-05-2025

Can anyone please help me to understand the issue, how can I resolve it .am I missing any plugins?

Use of (function executeRule(current, previous /*null when async*/)

Use of (function executeRule(current, previous /null when async/)