Web Reference: Oct 1, 2025 · There can be several reasons for the "uncaught typeerror" message in JavaScript. We review all the possible causes and fixes in this article. Oct 11, 2022 · In this article, you have learned how to fix the "Cannot read properties of undefined" error, which occurs when you attach these array methods to variables that are not declared or initialized as variables. That error message means that somewhere in your code, an attempt is being made to access a property with some name (here it's "push"), but instead of an object, the base for the reference is actually undefined. Thus, to find the problem, you'd look for code that refers to that property name ("push"), and see what's to the left of it.
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