How to count how many duplicate strings in the array using JavaScript without sorting

Question

I have seen a lot of solutions for this but most of them implement the sorting function like arr.sort() which can be used with letters and integers.

Take a look at my array

arr = ["COINS", "SWORDS",  "COINS", "COINS", "STARS", "SWORDS", "KNIGHTS"];

What I want is to count all occurrences of the duplicate strings. For example, based on my array. I want something like this as a result

arr = ["COINS", "SWORDS",  "COINS", "COINS", "STARS", "SWORDS", "KNIGHTS"];
result => 5 (3 coins + 2 swords)

Anyone can tell me how to solve this?

Refer http://stackoverflow.com/questions/19395257/how-to-count-duplicate-value-in-an-array-in-javascript — Akhil Balakrishnan, Dec 31 '15 at 06:54
"*result => 5 (3 coins + 2 swords)*" doesn't make sense. Be accurate and specific — Amit, Dec 31 '15 at 06:55

score 0 · Answer 1 · edited May 23 '17 at 11:59

0

The most logical way is to sort the array, then count the duplicates.

edited May 23 '17 at 11:59

Community

answered Dec 31 '15 at 07:07

jsdeveloper

1 Answers1