The conversation between human and AI assistant.
[|Human|] Write a JavaScript program that returns the sum of the first n numbers.
[|AI|] Here is the JavaScript program to find the sum of the first n natural  numbers:

```javascript
function sumOfN(n) {
    let sum = 0;
    // Loop for iteration over n numbers and adding the numbers to the sum
    for (let i = 1; i <= n; i++) {
        sum = sum + i;
    }    
    return sum;
}

let n = 5;  // n is the numbers of natural numbers to be considered
let result = sumOfN(n);
console.log(`The sum of first ${n} natural numbers is ${result}`);
```
This code uses a for loop to iterate over n numbers from 1 to n, adding the current number to the sum at each iteration. Finally, the function returns the sum of these numbers, which is stored in the `result` variable and printed on the console. 

For example, with n=5, the function will return the sum of `1 + 2 + 3 + 4 + 5`, which is 15.
[|Human|] 
Write a JavaScript program that returns the sum of the first n numbers.