Compare Date arrays in loop in Javascript

Question

I'am trying to compare 2 date arrays(all_date, click_date) and set value 0 in array clicks if date not exist in array click_date

all_date=["2015-10-17", "2015-10-18","2015-10-19", "2015-10-20","2015-10-21","2015-10-22"]

click_date=["2015-10-17", "2015-10-19", "2015-10-20"]

clicks=[5,3,1]

Final result:

clicks=[5,0,3,1,0,0]

i used this code:

if(key==0){
  $.each(all_date, function( j, v ) {

      if(dateInitial==v){

        clicks[0].push(parseInt(val["nbrclick"]));
        return false;

      }else{

        clicks[0].push(0);

      }
  });   
  }else{

    for (i=0; i < key; i++){

      $.each(all_date, function( j, v ) {

        if(dateInitial==v){

          clicks[key].push(parseInt(val["nbrclick"]));
          return false;

        }else{

          clicks[key].push(0);

        }
      });
    }
}

but i get clicks array like this [5,0,0,3,0,0,0,1,0...]

what is missing in my code?

what does dateInitial contain?

morels
– morels

2015-10-30 11:15:01 +00:00
Commented Oct 30, 2015 at 11:15 — morels
– morels, Commented Oct 30, 2015 at 11:15
dateInitial contain first date from array click_date

Takwa Chammam
– Takwa Chammam

2015-10-30 11:21:29 +00:00
Commented Oct 30, 2015 at 11:21 — Takwa Chammam
– Takwa Chammam, Commented Oct 30, 2015 at 11:21

Yeldar Kurmangaliyev · Accepted Answer · 2015-10-30 11:25:52Z

You can simply generate a new array using Array.prototype.map which generates a new array by applying a custom function to every item in an array.

For every item do the following:

if such date exists in click_date, then get this index and find clicks[index]
if such date does not exist - simply return 0

var all_date=["2015-10-17", "2015-10-18","2015-10-19", "2015-10-20","2015-10-21","2015-10-22"];
var click_date=["2015-10-17", "2015-10-19", "2015-10-20"];
var clicks=[5,3,1];

var result = all_date.map(function(x) {
  var indexInClickDate = click_date.indexOf(x);
  return (indexInClickDate > -1) ? clicks[indexInClickDate] : 0;
});

document.body.innerHTML = JSON.stringify(result);

Just to make it easier to understand, an algorithm above does almost the same as:

var all_date=["2015-10-17", "2015-10-18","2015-10-19", "2015-10-20","2015-10-21","2015-10-22"];
var click_date=["2015-10-17", "2015-10-19", "2015-10-20"];
var clicks=[5,3,1];

var result = [];

for (var i = 0; i < all_date.length; i++)
{
  var indexInClickDate = click_date.indexOf(all_date[i]);
  if (indexInClickDate > -1)
    result.push(clicks[indexInClickDate]);
  else
    result.push(0);
}

document.body.innerHTML = JSON.stringify(result);

However, map() function is more convenient to work with.

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