Web Reference: The courseReducer() replaces state.courses (which is [] acc. to assumption) with an integer. And this state update triggers a re-render and you end up calling map() on an integer and not on an array, thus resulting in TypeError: this.props.courses.map is not a function. Oct 8, 2020 · If the data isn't parsed correctly, you will run into errors, one of these being Uncaught TypeError: this.props.data.map is not a function. In this tutorial, you will learn why this error occurs and how to fix it. This error occurs when trying to access props in a React class component where the this context is undefined or not properly bound. Most commonly happens in event handlers or methods that have lost their binding to the component instance.
YouTube Excerpt: In this video, we tackle a common issue faced by
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