unique values in array count

Question

I have an array like the following

var data = [
            ["1"," 101_30.1.101_34","0.0200112629","mm/s","[OK]"],
            ["1"," 101_30.1.101_35","0.0146548533","mm/s","[OK]"],
            ["1"," 101_30.1.101_45","0.0146548533","mm/s","[OK]"],
            ["1"," 101_42.2.101_43","0.0101406257","mm/s","[OK]"],
            ["2"," 102_17.3.102_38","5.1719756","mm/s","[WA]"],
            ["2"," 102_17.3.102_39","3.5886707","mm/s","[WA]"],
            ["2"," 102_17.3.102_44","9.4615074E-4","mm/s","[OK]"],
            ["2"," 102_40.4.102_41","4.8159785","mm/s","[OK]"],
            ["3"," 204_15","3.8374166","mA","[OK]"],
            ["4"," 501_11","1027.5156","RPM","[WA]"]
           ]

What im trying to do is find how many unique array there are. Example 1=4,2=4,3=1,4=1

The data is coming from a database, so the number of arrays can always change.

Here is a simple jsfiddle of what im talking about JsFiddle

Are you looking to just find duplicates of the first value of the array? — Rory McCrossan
– Rory McCrossan, Commented Feb 29, 2012 at 16:07
Just iterate over the array and count the occurrences of the first element of each element. — Felix Kling
– Felix Kling, Commented Feb 29, 2012 at 16:08
Yes, basically im looking for duplicates of the first value. I dont want to remove them, i just need to count them. — Mario
– Mario, Commented Feb 29, 2012 at 16:11

gen_Eric · Accepted Answer · 2012-02-29 16:07:50Z

7

Try something like this:

var count = {};
$.each(data, function(){
    var num = this[0]; // Get number
    count[num] = count[num]+1 || 1; // Increment counter for each value
});
console.log(count); // {1: 4, 2: 4, 3: 1, 4: 1}

answered Feb 29, 2012 at 16:07

gen_Eric

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2 Comments

Patrick Over a year ago

@RocketHazmat I tried this but for some reason it's only counting until 9? ex: {1: 84, 2: 97, 3: 31, 4: 57, 5: 28, 6: 21, 7: 28, 8: 25, 9: 18} Also, what could I add so that duplicates are deleted?

gen_Eric Over a year ago

@Patrick: This question is almost 3 years old. Why not ask a new one? If you don't want to, at least tell me what you are trying to do. What do you mean by "only counting until 9"?

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