# Aufgabe
Write a program to determine if a string is a valid JavaScript variable name

Write a Python function that accepts a string as input and determines whether the string is a valid JavaScript variable name. If it is a valid variable name, return True, otherwise return False.

A valid JavaScript variable name meets the following conditions:

The variable name can only contain letters, numbers, underscores, and dollar signs ($).
The first character of the variable name must be a letter, underscore, or dollar sign.
The length of the variable name cannot exceed 255 characters.


# Prompt
Your task is to generate python code to solve the following problem. The generated code must be placed between the ```python and ```, and only one code block is allowed: 
Write a program to determine if a string is a valid JavaScript variable name

Write a Python function that accepts a string as input and determines whether the string is a valid JavaScript variable name. If it is a valid variable name, return True, otherwise return False.

A valid JavaScript variable name meets the following conditions:

The variable name can only contain letters, numbers, underscores, and dollar signs ($).
The first character of the variable name must be a letter, underscore, or dollar sign.
The length of the variable name cannot exceed 255 characters.

You need to follow the function names or class names in the test cases. The generated code should not contain any test cases: 
class Testis_valid_variable_name:
    def test_is_valid_variable_name(self):
        assert is_valid_variable_name('foo') == True