jquery - Javascript Multidimensional Array: Add Values - Stack Overflow

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So I have a multidimensional array like:

myArr = [["venue",2],["venue",16],["inning",2],["inning",4],["inning",32],["hithard", 4]]

I would like to add the similar values up. So in the end I just have:

"venue" = 18, "inning" = 38, and "hithard" = 4.

Can you give me an example of how to acplish this? Either with Javascript and/or jQuery

Thanks!

So I have a multidimensional array like:

myArr = [["venue",2],["venue",16],["inning",2],["inning",4],["inning",32],["hithard", 4]]

I would like to add the similar values up. So in the end I just have:

"venue" = 18, "inning" = 38, and "hithard" = 4.

Can you give me an example of how to acplish this? Either with Javascript and/or jQuery

Thanks!

• javascript
• jquery
• multidimensional-array
• addition

Share Improve this question Follow edited May 8, 2012 at 3:51 Ram 145k1616 gold badges172172 silver badges200200 bronze badges asked May 7, 2012 at 19:33 ksumarineksumarine 78222 gold badges1313 silver badges3333 bronze badges 7

• Do you want an array or object? Object is { venue=18, inning=36, hithard=4} and Array is [["venue", 18], ["inning", 38], ["hithard", 4]] – Selvakumar Arumugam Commented May 7, 2012 at 19:52
• Well I'm going to be turning this into a querystring to pass to a service so I'm sure either will work well – ksumarine Commented May 7, 2012 at 19:54
• you need a hash (object) – Gavriel Commented May 7, 2012 at 19:55
• 1 I'm going to add this to my list of interview questions, it's brought out a ton of interesting approaches – Mike Robinson Commented May 7, 2012 at 20:00
• 1 @Corey you can always use $.param to parse the obj to a query string. – Selvakumar Arumugam Commented May 7, 2012 at 20:11

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4 Answers 4

Sorted by: Reset to default 3

I am not sure if you want an array or object. If object, stop it is 1st pass and tmp in below code should return you the object as Object { venue=18, inning=38, hithard=4}.

DEMO

var tmp = {}, keys;
for (var i = 0; i < myArr.length; i++) {
    keys = myArr[i][0];
    tmp[keys] = (tmp.hasOwnProperty(keys))? 
              (tmp[keys] + myArr[i][1]):myArr[i][1];
} //tmp - will return you a Object { venue=18, inning=38, hithard=4}

var output = [];
for (keys in tmp) {
    output.push([keys, tmp[keys]]);
} //output will return you an array as [["venue", 18],["inning", 38],["hithard", 4]]     

myArr = [["venue",2],["venue",16],["inning",2],["inning",4],["inning",32],["hithard", 4]];
values = {};
for (i=0;i<myArr.length;i++){
   if ("undefined" == typeof values[myArr[i][0]]) {values[myArr[i][0]] = 0;}
   values[myArr[i][0]] += myArr[i][1];
}
arr = [];
query_string = "";
for (i in values) {
    // if you want it in an array:
    arr.push('"' + i + '" = ' + values[i]);
    query_string += (query_string.length ? "&" : "") + i + "=" + values[i];
}
​console.log(arr);​

DEMO: http://jsfiddle/Ta97E/2/

you can use values to create the query string

Check this code:

var final = {};
for (var i in myArr) {
    var item = myArr[i];
    final[item[0]] = (final[item[0]] || 0) + item[1];
}

console.log(final);​

DEMO: http://jsfiddle/UVJEb/

Underscore solution:

 sums = _.reduce(myArr, function (obj, item) { 
    obj[item[0]] = (obj[item[0]] || 0) + item[1]; 
    return obj; 
 }, {});

 // sums = {"venue":18,"inning":38,"hithard":4}

A little dirtier in jQuery

sums = {}

$.each(myArr, function (i, value) {
    sums[value[0]] = (sums[value[0]] || 0) + value[1];
});

Edit: add jQuery version

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