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Lynx
  • English
  • 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.