# Constants

Constants can be one of two types: 


## Named exports

Named exports are used to reduce the mistakes caused by mistakes in strings.
If the site is using variations on the name of a constant make sure to standardise to just one.

1. Uppercase.
2. Exports a single string.
3. File name is singular. (trc/constants/Color.js)


```js
export RED = '#FF0000';
export BLUE = '#00FF00';
export GREEN = '#0000FF';
```


## Collections

Collection constants are used to group things that share one parent type.
Where possible limit the number of custom props. 
If the site is using variations on the name of a constant make sure to standardise to just one.

1. Exports a single array through `default`.
2. Each element must be an object.
3. Each object must contain a `value` field.
4. Uppercase is preffered.
5. May contain other custom properties.
6. Filename is pluralized. (trc/constants/DepartmentCategories.js)

```js
export default = [
    {value:"tech",          label: "Tech"},
    {value:"sales",         label: "Sales"},
    {value:"service",       label: "Service"},
    {value:"parts",         label: "Parts"},
    {value:"management",    label: "Management"},
    {value:"TMCA",          label: "TMCA"},
    {value:"body_paint",    label: "Body & Paint"}
];
```