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// function to generate a random tweet tweet
function ranDom (arr) {
  var index = Math.floor(Math.random()*arr.length);
  return arr[index];
};

This is the code used

about 4 years ago · Juan Pablo Isaza

Answer question

Answer 1 · 2022-06-28T06:21:31.883Z

Works fine here:

function ranDom (arr) {
  return arr[Math.floor(Math.random()*arr.length)];
};

var items = [254, 45, 212, 365, 2543];
console.log(ranDom(items));

Answer 2 · 2022-06-28T06:21:31.892Z

In general, you can add this line in the start of your function

if (arr === undefined){
    return DEFAULT_VALUE; \\define your default value for this case..
}

to handle this case.

But you need to investigate why your arr is undefined from the function call.