const five = function() {
console.log(5)
}
const func = function(callback) {
console.log(3)
callback
console.log(7)
}
func(five)I would like to know why I have in the output
3
7
instead of
3
5
7
I tried to put callback() with parentheses and I got an error, why?
Even though the function is assigned to a variable you need to call it as a function, with parentheses.
const five = function() {
console.log(5)
}
const func = function(callback) {
console.log(3)
callback()
console.log(7)
}
func(five)The issue with your code is that you aren't calling callback with parentheses.
To invoke a function in JavaScript, you need to use parentheses at the end, even if you don't need to pass in any parameters.
So, change your callback line from this:
callback;
To this:
callback();
In summary, this is the fully working code.
const five = function() {
console.log(5);
}
const func = function(callback) {
console.log(3);
callback(); // This line has been modified
console.log(7);
}
func(five); // Should output: 3, 5, 7