(ES6) ES6 (2016)

MapForeach (MP60)

   1:  // Use forEach for side effects
   2:  const cartItems = ['apple', 'banana', 'orange'];
   3:  cartItems.forEach(item => {
   4:      addToCartDOM(item); // hypothetical function to update UI
   5:  });
   6:  
   7:  // Use map when you need a transformed array
   8:  const itemLengths = cartItems.map(item => item.length);
   9:  console.log(itemLengths); // [5, 6, 6]
  10:  
  11:  


Difference Between map() and forEach() in JavaScript




Feature	map()	forEach()


Return value	Returns a new array	Returns undefined


Purpose	Transformation of array elements	Side effects (like logging)


Chainability	Can be chained with other methods	Cannot be chained (returns undefined)


Immutability	Creates new array (immutable)	Modifies original array (mutable)




MapForeach context:





ES6 context:



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