Day 1: Functions Solution
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Also visit this link: Day 1: Arithmetic Operators Solution.
Day 1: Functions Solution
Objective
Today, we’re discussing JavaScript functions. Check out the attached tutorial for more details.
Task
Implement a function named factorial that has one parameter: an integer, n. It must return the value of n! (i.e., n factorial).
Input Format
Locked stub code in the editor reads a single integer, n, from stdin and passes it to a function named factorial.
Constraints
- 1 <= n <= 10
Output Format
The function must return the value of n!.
Sample Input 0
4
Sample Output 0
24
Explanation 0
We return the value of 4! = 4 x 3 x 2 x 1 = 24.
Solution – Day 1: Functions
'use strict';
process.stdin.resume();
process.stdin.setEncoding('utf-8');
let inputString = '';
let currentLine = 0;
process.stdin.on('data', inputStdin => {
inputString += inputStdin;
});
process.stdin.on('end', _ => {
inputString = inputString.trim().split('\n').map(string => {
return string.trim();
});
main();
});
function readLine() {
return inputString[currentLine++];
}
/*
* Create the function factorial here
*/
function factorial(n) {
if (n < 2){
return 1;
}
return n * factorial(n-1);
}
function main() {
const n = +(readLine());
console.log(factorial(n));
}