assert method

Sends a message to the console if the expression provided evaluates to false. The message text color is red and it is prefaced by an error icon.

 

Syntax

Console.assert(test, message, optionalParams);

Parameters

• test [in]
  Type: boolean

  An expression that if false, will cause an assert message to be sent. True results, no message is sent.

• message [in]
  Type: DOMString

  The message to display.

• optionalParams [in]
  Type: any

  A value or string that can be used with replaceable parameters in the main message.

Return value

This method does not return a value.

Remarks

The optional parameters can be used to provide a replaceable value in the message. For example, you could include a specific message or value as the optional parameter, rather than building a string by concatenating the value to the message string.

  function sendAssertConsole(cmpValue) {
       
        window.console.assert( (cmpValue > 3), "%s is too small", cmpValue);
    }

See also

Console