# 2.9 Functions

What is the process of converting the angle 60 to a radian value or finding the length of the string that the variable mystr contains? 

HRScript provides various functions that receive inputs through parameters, perform some processing, and return the result values. 

Functions can be used as part of an expression, as shown below.

```python
var dg=60, rd
rd=deg2rad(dg)

var limit=40, message="Input your code number"
var validity= len(message) < limit
```

The list of functions provided in HRScript is as follows. (The tables are sorted in the ascending order of names.)