## Math

### constrain()

Constrains a number to be within a range.

`constrain(x, a, b);`

`x`

is the number to constrain, all data types
`a`

is the lower end of the range, all data types
`b`

is the upper end of the range, all data types

The function will return:
`x`

: if x is between `a`

and `b`

`a`

: if `x`

is less than `a`

`b`

: if `x`

is greater than `b`

```
// EXAMPLE USAGE
sensVal = constrain(sensVal, 10, 150);
// limits range of sensor values to between 10 and 150
```