RangeError: Invalid array length

javascript

Error message

RangeError: Invalid array length

What broke

This error occurs when you try to create an array with a negative length or a length that exceeds the maximum allowed size. For example, using a non-integer value or a very large number can trigger this error.

Why it broke

The root cause is that JavaScript arrays cannot have lengths that are negative or greater than 2^32 - 1. When you attempt to set an array length to an invalid value, JavaScript throws a RangeError.

How to fix

To fix this error, ensure that the length you are trying to assign to the array is a non-negative integer and within the valid range. You can add checks to validate the length before creating the array.

Code fix

const length = Math.max(0, Math.min(1000, desiredLength)); const myArray = new Array(length);

Explained by ErrorOracle

Prevention tip

You can add checks to validate the length before creating the array.

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What broke

Why it broke

How to fix

Code fix

Prevention tip

Related errors

SyntaxError: invalid syntax

panic: runtime error: index out of range [3] with length 3

ValueError: invalid literal for int() with base 10: 'abc'

Error: EINVAL: invalid argument, open '/path/to/file'

IndexError: list index out of range

Related errors

SyntaxError: invalid syntax

panic: runtime error: index out of range [3] with length 3

ValueError: invalid literal for int() with base 10: 'abc'

Error: EINVAL: invalid argument, open '/path/to/file'

IndexError: list index out of range