The **`log()` function** in Dart calculates the natural logarithm of a number. 
The image below shows the mathematical representation of the `log()` function.

>The `dart:math` module is required for this function.

#     
## Syntax
```dart
double log(double num)
```
## Parameters
This function requires:
- A #key# number: must be greater than 0 #key# for which the logarithm is to be calculated.


## Return value
`log()` returns the natural logarithm of the number sent as a parameter.

- If the parameter value is less than zero, then `log()` returns `NaN`.
- If the parameter value is zero, then `log()` returns `negativeinfinity`.



## Code
The following code shows how to use `log()` in Dart.


import 'dart:convert';
import 'dart:math';
void main() {
    //positive number
    print("The value of log(10) = ${log(10)}"); 

    // e
    print("The value of log(e) = ${log(e)}"); 

    //negative number
    print("The value of log(-2) = ${log(-2)}"); 

    //zero number
    print("The value of log(0) = ${log(0)}"); 
}

What is log() in Dart?

The log() function in Dart calculates the natural logarithm of a number, requiring dart:math and only accepting values greater than 0.