Array element count in jquery

Question

I have an array like

[
   {date:'1/8/14',code:'AV-502'},
   {date:'1/8/14',code:'AV-501'},
   {date:'2/8/14',code:'AV-502'},
   {date:'2/8/14',code:'AV-501'},
   {date:'2/8/14',code:'AV-502'}
]

How can I get the count of each code for a date ie count of AV-502 for date 1/8/14 and the same for 2/8/14 and so on in jquery. The result needed is like

[
       {date:'1/8/14',code:'AV-502',count:2},
       {date:'1/8/14',code:'AV-501',count:3},
       {date:'2/8/14',code:'AV-501',count:5}
]

You've said you want the count, but your "the result needed" is an array. Which is it? — T.J. Crowder, Mar 14 '14 at 10:02
Thats not a valid JS object. 1/8/14, etc. should be string no? — Liam, Mar 14 '14 at 10:02

score 1 · Accepted Answer · answered Mar 14 '14 at 10:01

Try this:

var getCount = function (date, code) {
    var count = 0;
    $.each(arr, function (key, val) {
        if (val.date === date && val.code === code) {
            count++;
        }
    });
    return count;
}

//call this function
getCount('1/8/14', 'AV-502');

score 1 · Answer 2 · edited May 23 '17 at 12:05

1

You loop through and count them.

You have a bunch of options for how you loop through and count them. Several are described in this question and its answers.

In addition to those, there's the ES5 Array#reduce function:

var count = yourArray.reduce(function(prev, entry) {
    return entry.code === "AV-502" ? prev + 1 : prev;
}, 0);

edited May 23 '17 at 12:05

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answered Mar 14 '14 at 10:02

T.J. Crowder

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Array element count in jquery

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