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      • console: assert() method

      assert writes an error message to the console if the assertion is false. If the assertion is true, nothing happens.

      Syntax

      assert(assertion: boolean, val1, val2, ...): undefined;

      Parameters

      assertion

      Any boolean expression. If the assertion is false, a generic message indicating assertion failure is written to the console.

      val1, val2, ...

      A list of JavaScript values to output.

      return value

      None(undefined).

      Compatibility

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      Except as otherwise noted, this work is licensed under a Creative Commons Attribution 4.0 International License, and code samples are licensed under the Apache License 2.0.