# Expression evaluator to format a file name for pollution files downloaded from WashU


 [Source code](wustl_file_patterncwl_src.md) 


```{contents}
---
local:
---
```

**JavaScript Tool** 

## Description

Given input directory, variable (band), year and month,
evaluates the expected file name for the input data


## Inputs

| Name      | Type      | Default | Description | 
|:----------|:----------|:--------|:------------|
| downloads | Directory |         |             | 
| year      | int       |         |             | 
| variables | string[]  |         |             | 

## Outputs

| Name         | Type   | Description | 
|:-------------|:-------|:------------|
| netcdf_files | File[] |             |