CODEWITHSUNDEEP
javascriptarraysforeach
user6488504
user6488504

Reputation:

forEach to mimic .map() function

I am trying to mimic array.map() using forEach().

var map = function () {
  var empMap = [];
  numbers.forEach(function (number) {
    empMap.push(number);
    console.log('empMap', empMap);
  });
  return(empMap);
}

var numbers = [1, 2, 3];
//implement this line

var doubles = map(numbers, function (number) {
  return number * 2;
});
console.log(doubles); // [2, 4, 6]

So, I have this numbers array with values and I have my own map function to iterate through the array and then I pushing the values in an empty array empMap

later, I am calling this map function and multiplying each value with 2 and printing it out.

I should get the output of doubles as [2, 4, 6] instead I am getting [1,2,3]. Not sure where I going wrong.

This is the [codepen]1 for the same.

Upvotes: 0

Views: 203

Answers (1)

nicholaswmin
nicholaswmin

Reputation: 22939

You need to pass the array and the callback as arguments and then actually use the callback.

var map = function (array, callback) {
  var empMap = [];

  array.forEach(function (number) {
    empMap.push(callback(number))
  });

  return(empMap);
}

var numbers = [1, 2, 3];

var doubles = map(numbers, function (number) {
  return number * 2;
});

console.log(doubles); // [2, 4, 6]

Upvotes: 4

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