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map vs for each

Pierus 
forEach() just loop through the elements. It's throws away return values and always returns undefined.The result of this method does not give us an output .

map() loop through the elements allocates memory and stores return values by iterating main array

Example:

   var numbers = [2,3,5,7];

   var forEachNum = numbers.forEach(function(number){
      return number
   })
   console.log(forEachNum)
   //output undefined

   var mapNum = numbers.map(function(number){
      return number
   })
   console.log(mapNum)
   //output [2,3,5,7]
map() is faster than forEach()
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Lorena Rocha 90 points 

                                    chars = ['Hello' , 'world!!!'] ;
var retVal = chars.forEach(function(word){
  console.log("Saving to db: " + word) 
})
console.log(retVal) //undefined

chars = ['Hello' , 'world!!!'] ;
var lengths = chars.map(function(word){
  return word.length
}) 
console.log(lengths) //[5,8]

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