Rowland – hkhazo.biz.id

Before we dive into the solutions, let’s take a look at some common scenarios that can trigger the “TypeError: Cannot read properties of undefined (reading ‘map’)” error:

• Using `map()` on an undefined array or object:

  const arr = undefined;
  arr.map(item => console.log(item));

• Trying to access a non-existent property in an object:

  const obj = { foo: 'bar' };
  obj.nonExistentProperty.map(item => console.log(item));

• Using `map()` on an array that’s still being fetched or initialized:

  const [data, setData] = useState([]);
  data.map(item => console.log(item));