console: count() static method - Web APIs | MDN (original) (raw)

For example, given code like this:

function greet(user) {
  console.count();
  return `hi ${user}`;
}

greet("bob");
greet("alice");
greet();
console.count();

Console output will look something like this:

"default: 1" "default: 2" "default: 3" "default: 4"

The label is displayed as default because no explicit label was supplied.

If we pass the user variable as the label argument to the first invocation of console.count(), and the string "alice" to the second:

function greet(user) {
  console.count(user);
  return `hi ${user}`;
}

greet("bob");
greet("alice");
greet("alice");
console.count("alice");

We will see output like this:

"bob: 1" "alice: 1" "alice: 2" "alice: 3"

We're now maintaining separate counts based only on the value of label.