How Many Arguments Can a JavaScript Function Really Accept?

JavaScript Function Argument Limits

JavaScript allows functions to accept a flexible number of arguments, raising the question of whether this flexibility extends to arbitrary limits.

Theoretical Maximum

The ECMAScript specification does not explicitly restrict the number of arguments a function can have. As such, there is no theoretical maximum.

Practical Considerations

Despite the lack of theoretical constraints, in practice, JavaScript functions face limits imposed by browser implementations.

Implementation-Dependent Limits

The maximum number of arguments a function can accept varies across implementations, as evidenced by experiments conducted in a recent article.

For example:

• In Chrome, the limit was approximately 65,535 arguments using the apply() method.
• In Firefox, the limit was around 262,143 arguments.
• Opera exceeded one million arguments, with a limit near 1,048,576.

Impact of Invocation Method

The method used to invoke a function can also affect the maximum number of arguments. Using the eval() method, for instance, often results in lower limits compared to other methods.

Conclusion

While there is no inherent limit on the number of arguments a JavaScript function can accept, practical constraints imposed by browser implementations typically restrict the number of arguments to a range between tens of thousands and millions. The actual limit depends on the specific implementation and the method of invocation.

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