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The each method is meant to be an immutable iterator, where as the map method can be used as an iterator, but is really meant to manipulate the supplied array and return a new array. Another important thing to note is that the each function returns the original array while the map function returns a new array.
map() does not have a way to terminate the iteration.
Differences between forEach() and map() methods:The forEach() method does not create a new array based on the given array. The map() method creates an entirely new array. The forEach() method returns “undefined“. The map() method returns the newly created array according to the provided callback function.
As always, the choice between map() and forEach() will depend on your use case. If you plan to change, alternate, or use the data, you should pick map() , because it returns a new array with the transformed data. But, if you won't need the returned array, don't use map() - instead use forEach() or even a for loop.
Is there any difference between .each() and .map() when no value is returned? Is there any benefit in using one or the other in this case?
myList.map(function(myModel, myIndex){
myModel.itemOne = itemOne;
myModel.itemTwo = itemTwo;
myModel.itemThree = itemThree;
});
myList.each(function(myModel, myIndex){
myModel.itemOne = itemOne;
myModel.itemTwo = itemTwo;
myModel.itemThree = itemThree;
});
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