Both forEach() and map() are array methods in Javascript, but they have some differences in terms of their functionalities and their returned results.
Purpose
The forEach() method is used to execute a provided function once for each array element without returning any value. Whereas, the map() method is used to execute a provided function once for each array element and returns a new array with the results of the function execution.
Return value
The forEach() method doesn’t return any value, while the map() method returns a new array with the modified data.
Working with array elements
The forEach() method works with individual array elements, but it doesn’t create a new array that can be used for further processing. The map() method also works with individual array items but it creates a new array by modifying the data.
Mutability
The forEach() method can be used to modify existing array items, but it doesn’t create a new array. The map() method, on the other hand, creates a new array that can be used to replace the existing array.
Usage
The forEach() method is used when we want to iterate through an array and perform an action on each element. The map() method is used when we want to iterate an array and modify each element and create a new array with the modified data.
In conclusion, the key differences between forEach() and map() are that forEach() doesn’t return a new array with the modified data, while map() returns a new array with the modified data. Therefore, we can choose to use either of them based on our requirements.
