# Overview

To find the number of expected parameters, we can apply the `length` property to the function that returns the length or the number of parameters.

# Syntax
We can use the below syntax to get the number of parameters expected by a function:
``` 
function_name.length
```


# Example
In the following example, we create two functions:
1. **`multiply`**: It takes `2` parameters and returns their multiplication.
2. **`sum`**: It takes `4` parameters and returns the sum of all parameters.


//define a function
function multiply(a, b){
  return a * b;
}

//get the number of parameters for function multiply
console.log(multiply.length)

//define a function
function sum(num1, num2, num3, num4){
    return num1 + num2 + num3 + num4;
}

//get the number of parameters for function sum
console.log(sum.length)


# Explanation
In the code above, 

**Line 7**: We get the number of parameters of function `multiply` by calling the `length` property on it.

**Line 15:** We get the number of parameters of function `sum` by calling the `length` property on it.

How to find the number of parameters expected by a JS function

Overview

Syntax

Example

Explanation