setTimeout - callback argument must be a function

Question

My code was working until i updated node.js to version 8.11.3

Now i always get error \"callback argument must be a function\" when trying to call a function with setTim

Answer 1

Q: I am getting the error "callback argument must be a function" when trying to call a function with setTimeout. Why?

A: setTimeout(testFunction(itemid, price), 100); You have accidentally pushed the output of testFunction as the first argument of setTimeout which it is suppose to be a function and hence the error.

What you could do is, pass in a function and call the testFunction recursively from there.

Example:

function test(itemid, price) {
    console.log("hello => " + itemid + ", " + price);
    if (price < 50) {
      setTimeout(() => { test(itemid, price + 10) }, 100);    
    }
}

test(100, 10)