Web Reference: The TypeError: .map is not a function is a clear signal that you are attempting to use an array method on a value that is not an array. To solve it, follow this diagnostic process: The "TypeError: map is not a function" occurs when we call the map()methodon a value that is not an array. To solve the error, console.log the value you're calling the map() methodon and make sure to only call mapon valid arrays. Here is an example of how the error occurs. We called theArray.map()method on an object and got the error back. Apr 7, 2019 · If you're not going to use the return value of .map() than you shouldn't be using .map(). In your case you should be using .forEach() - and with a modern browser this will already be available on the NodeList
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