Web Reference: Oct 21, 2019 · The issue is attempting to access arrayWord[i] when i == arrayWord.length, it will always be undefined (because length is always at least 1 greater than the last index in the array). Aug 16, 2022 · To fix the “cannot read property ‘length’ of undefined” error, perform an undefined check on the variable before accessing the length property from it. 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.
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