# Day 3: Throw | 10 Days Of JavaScript | HackerRank Solution

Hello coders, today we are going to solve Day 3: Throw HackerRank Solution which is a part of 10 Days of JavaScript Series.

## Objective

In this challenge, we practice using throw and catch statements to work with custom error messages.

Complete the isPositive function below. It has one integer parameter, a. If the value of a is positive, it must return the string `YES`. Otherwise, it must throw an Error according to the following rules:

• If a is 0throw an Error with message = `Zero Error`.
• If a is negative, throw an Error with message = `Negative Error`.

## Input Format

Locked stub code in the editor reads the following input from stdin and passes each value of a to the function as an argument:
The first line is an integer, n, denoting the number of times the function will be called with some a.
Each line i of the n subsequent lines contains an integer denoting some a.

## Constraints

• 1 <= n <= 5
• -100 <= a <= 100

## Output Format

If the value of a is positive, the function must return the string `YES`. Otherwise, it must throw an Error according to the following rules:

• If a is 0throw an Error with message = `Zero Error`.
• If a is negative, throw an Error with message = `Negative Error`.

Sample Input 0

``````3
1
2
3``````

Sample Output 0

``````YES
YES
YES``````

Explanation 0

Each of the given values is positive, so we return `YES` each time. The value returned during each function call is printed on a new line by locked stub code in the editor.

Sample Input 1

``````3
2
0
6``````

Sample Output 1

``````YES
Zero Error
YES``````

Explanation 1

Locked stub code in the editor makes the following three calls to the isPositive function:

1. `isPositive(2)`: This returns `YES` because 2 is positive.
2. `isPositive(0)`: Because a = 0, we throw an Error with message = `Zero Error`. This is caught by the locked stub code and the value of its message is printed.
3. `isPositive(6)`: This returns `YES` because 6 is positive.

Sample Input 2

``````2
-1
20``````

Sample Output 2

``````Negative Error
YES``````

Explanation 2

Locked stub code in the editor makes the following two calls to the isPositive function:

1. `isPositive(-1)`: Because a = -1, we throw an Error with message = `Negative Error`. This is caught by the locked stub code and the value of its messages is printed.
2. `isPositive(20)`: This returns `YES` because 20 is positive.

## Solution – Day 3: Throw

```'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();
});

return inputString[currentLine++];
}

/*
* Complete the isPositive function.
* If 'a' is positive, return "YES".
* If 'a' is 0, throw an Error with the message "Zero Error"
* If 'a' is negative, throw an Error with the message "Negative Error"
*/
function reverseString(s){
try{
var sString = s.split("");
var rArray = sString.reverse ();
var joinArray = rArray.join("");
console.log(joinArray);
} catch(error){
console.log(error.message);
console.log(s);
}
}
function isPositive(a) {
if (a > 0){
return "YES";
}
else if (a == 0){
throw new Error("Zero Error");
}
else if (a < 0){
throw new Error ("Negative Error");
}
}

function main() {