'map()' and 'forEach()' are both methods used to iterate over arrays in JavaScript, but they have some key differences.
'forEach()' is a method that executes a provided function once for each array element.
It does not return a new array but instead modifies the original array in place.
'map()' is a method that creates a new array by calling a provided function on every element in the original array.
It does not modify the original array but instead returns a new array with the results of the function calls.
'map()' is generally preferred over 'forEach()' when you need to transform elements in an array into a new array, as it provides a cleaner and more functional programming-style syntax.
'forEach()' is more appropriate when you need to perform a side effect for each element in the array, such as logging to the console or updating a variable.
Overall, 'map()' and 'forEach()' are both useful methods for iterating over arrays in JavaScript, but they are used in different scenarios depending on whether you need to modify the original array or create a new array.