Fix TypeError map is not a function in JavaScript

In this tutorial, we are going to learn about how to fix the TypeError: map is not a function in JavaScript

When we use a Array.map() method on a value which is not an data type array we will get the following error in our console.

Example:

const obj =  {};

obj.map(element => {
    console.log(element);
});

Output:

"TypeError: obj.map is not a function

In the example above, we are getting the error because we using the map() method on a object.

To fix the error, we need to call the map() method on a data type array.

Here is an example:

const arr = [2, 3, 4];

arr.map(el=> el+2);

or we can check if the given value is an type array or not before calling the map() method on it.So that we can avoid runtime errors.

var arr = [2, 3, 4];

if(Array.isArray(arr)){
    arr.map(el=> el+2);
}