Web Reference: May 4, 2018 · 0 Arrays are 0-indexed. The last item of the array can be accessed with arr[arr.length - 1]. In your example, you're attempting to access an element at an index that doesn't exist. The JavaScript exception "Invalid array length" occurs when specifying an array length that is either negative, a floating number or exceeds the maximum supported by the platform (i.e. when creating an Array or ArrayBuffer, or when setting the length property). This guide will explain what the .length property is, the common reasons your variable might be undefined, and the standard, robust solutions to fix this error, including providing default values and using modern optional chaining.
YouTube Excerpt: Learn how to fix the error "Cannot read property
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