---
title: "Change the Grade Level to Numbers"
slug: "change-the-grade-level-to-numbers"
description: "How to use a mapping expression in Studio to change a student's grade level from a string to a number."
tags: ["Studio", "Field Mappings", "Advanced"]
updated: 2023-07-31T17:48:31Z
published: 2023-07-31T17:48:31Z
canonical: "help.rapididentity.com/change-the-grade-level-to-numbers"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.rapididentity.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Change the Grade Level to Numbers

## How to Change the Grade Level to a Number

The OneRoster data type standard for the `grades` field on the user record is `string` with specific values expected based on the grade.

The following example was used to convert a grade level of `KG` to 0 and `PR` to -1 allowing all other grade level values to remain the same.

```
function() {
  const grades = SRC.grade;

  if (grades) {

    const grade = grades[0];

      if (grade == 'KG') {
        return '0';
      } 

      else if (grade =='PR') {
        return '-1';
      } 
      
      else {
        return grades;
      }
    
  }
  
  return null;
   
}
```

## Related

- [Studio Expressions](/expressions.md)
- [Mappings, Matching and Event Governance](/mappings-matching-and-event-governance.md)