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.

Collectives™ on Stack Overflow

Compare Date arrays in loop in Javascript

1 Answer 1

Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Related