JavaScript Demo: Standard built-in objects

function div(x) {
  if (isFinite(1000 / x)) {
    return 'Number is NOT Infinity.';
  }
  return "Number is Infinity!";
}

console.log(div(0));
// expected output: "Number is Infinity!""

console.log(div(1));
// expected output: "Number is NOT Infinity."

JavaScript Demo: Standard built-in objects - isFinite()

​x
function div(x) {
  if (isFinite(1000 / x)) {
    return 'Number is NOT Infinity.';
  }
  return "Number is Infinity!";
}
​
console.log(div(0));
// expected output: "Number is Infinity!""
​
console.log(div(1));
// expected output: "Number is NOT Infinity."
​