Logs the number of times that this particular call to count() has been called. This function takes an optional argument label.

Note: This feature is available in Web Workers.

If label is supplied, this function logs the number of times count() has been called with that particular label.

If label is omitted, the function logs the number of times count() has been called at this particular line.

For example, given code like this:

var user = "";

function greet() {
  console.count();
  return "hi " + user;
}

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

Console output will look something like this:

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

Note the final line of log output: the separate call to count() at line 11 is treated as an independent event.

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

var user = "";

function greet() {
  console.count(user);
  return "hi " + user;
}

user = "bob";
greet();
user = "alice";
greet();
greet();
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. Because the label "alice" in line 11 matched the value of user twice, it is not considered an independent event.

Syntax

console.count([label]);

Parameters

label
A string.
If supplied, count() outputs the number of times it has been called with that label.
If omitted, count() outputs the number of times it has been called at that line.

Specifications

Specification Status Comment
Console API
The definition of 'console.count()' in that specification.
Living Standard Initial definition

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support YesEdge Full support 12Firefox Full support 30IE Full support YesOpera Full support YesSafari Full support YesWebView Android ? Chrome Android ? Edge Mobile Full support YesFirefox Android Full support 30Opera Android ? Safari iOS ? Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

Document Tags and Contributors

Last updated by: irenesmith,