Console.count()

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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.

Syntax

console.count( [label] );

Parameters

label Optional
A String. If supplied, count() outputs the number of times it has been called with that label. If omitted, count() behaves as though it was called with the "default" label.

Examples

For example, given code like this:

let 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: 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 count(), and the string "alice" to the second:

let 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.

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 AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
countChrome Full support YesEdge Full support 12Firefox Full support 30IE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android Full support 30Opera Android ? Safari iOS ? Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown