Javascript Map Array Function

First, define a function that calculates the area of a circle. Therefore, the first array will remain unchanged: Then, pass the circlearea function to the map() method.

The following code takes an array of numbers and creates a new array containing the square roots of the numbers in the first array. Its syntax is as follows −. // roots is now [1, 2, 3] // numbers is still [1, 4, 9] copy to clipboard.

Here is the syntax for the map().

This is the required parameter of this method of map() function as it constitutes the call to the operation need to be performed on every element of the array to create the new array. Const roots = numbers.map((num) => math.sqrt(num)); The javascript map () method returns a newly created array with the results of invoking the callback function on each element of the array. .map () can be used to iterate through objects in an array and, in a similar fashion to traditional arrays, modify the content of each individual object and return a new array.