Javascript Array Map Is Not A Function

In that case, the function returns undefined, what you are seeing in the result. Because superhero is not an array. The this argument will be used inside the callback function.

You can use the shorthand syntax. So my goal is simple to map some headings and rows in a table in my custom component, but when i get to make the mapping its always says variable.map() is not a function event tho. Map() does not execute the function for empty elements.

The callback function is provided with three parameters as follows:

Because superhero is not an array. // roots is now [1, 2, 3] // numbers is still [1, 4, 9] copy to clipboard. The map() method applies a function to each element in an array and returns a copy of the original array with modified values (if any). What you actually want is a filter function.