Hi @SandeepKSingh
Functional programming (FP) is a programming paradigm where the primary building blocks are pure functions—functions that always produce the same output for the same input and have no side effects. It emphasizes:
- Immutability: Data should not be changed once created. Instead, create new data structures.
- Declarative Code: Focus on "what to do" rather than "how to do it."
- Higher-Order Functions: Functions that take other functions as arguments or return them as results.
- Avoiding Side Effects: Functions shouldn’t affect the program's state or depend on global variables.
Functional Programming in ServiceNow
While ServiceNow primarily uses JavaScript for scripting (which supports functional programming constructs), the platform isn't inherently functional. However, you can apply FP principles in areas like:
- Script Includes: For reusable utilities and data processing.
- Transform Maps: When working with integrations.
- Client Scripts & Catalog Client Scripts: To process data on the client-side.
- REST API Responses: To filter and transform large JSON datasets.
- Background Scripts: For server-side data manipulation.
Core JavaScript Functional Methods
You can use JavaScript's functional programming methods in ServiceNow scripting. These include:
- map(): Transform each element in an array.
- filter(): Filter elements based on a condition.
- reduce(): Reduce an array to a single value (e.g., sum).
- forEach(): Iterate through elements for side effects.
- Example :-
-
var incidentGR = new GlideRecord('incident');
incidentGR.addQuery('active', true);
incidentGR.query();
var incidents = [];
while (incidentGR.next()) {
incidents.push({
number: incidentGR.getValue('number'),
priority: incidentGR.getValue('priority')
});
}
// Transform priorities to human-readable labels
var transformed = incidents.map(function (incident) {
return {
number: incident.number,
priorityLabel: incident.priority === '1' ? 'Critical' : 'Non-Critical'
};
});
gs.info(JSON.stringify(transformed, null, 2));
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Thanks and Regards
Ravi Gaurav | ServiceNow MVP 2025,2024 | ServiceNow Practice Lead | Solution Architect
CGI
M.Tech in Data Science & AI
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