NULL Output for writing a code for displaying random string out of the declared array

Question

I am writing this as a lambda function which should Display a random string out of the declared array, but upon the time of execution, it displays "NULL". Please can anyone suggest me the correct code or syntax and tell me whats wrong with this code.

exports.handler = async (event) => {
    let messages = ["AWS","Pranav","Hello World"];
    let response = messages[Math.floor(Math.random()*100)];
    return response;
};

There's a 97% likelihood that your random number is greater than 2, in which case there is no message at that index. — Heiko Theißen, Oct 08 '22 at 07:26

score 0 · Answer 1 · answered Oct 08 '22 at 12:31

Nothing to do with Lambda, error is in the way you take a random array element.

Change it to this:

exports.handler = async (event) => {
    let messages = ["AWS","Pranav","Hello World"];
    let response = messages[Math.floor(Math.random()*messages.length)];
    return response;
};

Instead of multiplying Math.random() by 100, which gives you a random number between 0 and 100, you should multiply it by messages.length.

More examples on generating a random number in JS here: https://stackoverflow.com/a/24152886/2727317

NULL Output for writing a code for displaying random string out of the declared array

1 Answers1