How to push values to a multi-dimensional array

Question

I can't figure out how to push values to a dynamic multi-dimensional array. This is the code i have:

function compareNumbers(){
    var count = $('.finishedRow').length;
    var inputtedNums = new Array();
    for(var i=0; i<count; i++){
        $('.finishedRow').eq(i).find('li').each(function(j){
            inputtedNums[i].push($(this).text());
        });
    }
    console.log(inputtedNums);
}

So say there are, for example, 3 finishedRow selectors and each finishedRow selector contains 4 li elements with values of first, second, third, fourth. I want my inputtedNums variable to look like:

inputtedNums = [
   ["first", "second", "third", "fourth"],
   ["first", "second", "third", "fourth"], 
   ["first", "second", "third", "fourth"] 
]

As my code is now I get the error: Cannot call method 'push' of undefined.

I'm sure I'm missing something fundamental here.

Matthias · Accepted Answer · 2012-12-16 13:20:57Z

4

You need to initialize every nested array first.

for(var i = 0; i < count; i++) {
    inputtedNums[i] = new Array();
    $('.finishedRow').eq(i).find('li').each(function(j) {
        inputtedNums[i].push($(this).text());
    });
}

answered Dec 16, 2012 at 13:20

Matthias

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3 Comments

garethdn Over a year ago

I knew the solution was probably simple but didn't think it would be that simple! Thanks

Brownman Revival Over a year ago

hi how can i put variable key into your solution?

Eswar reddy Over a year ago

I have similar code as below but I am getting erro: 0x800a138f - JavaScript runtime error: Unable to get property 'push' of undefined or null reference $.each(data.data, function (index, item) { debugger; if (item.Dataset != '' && item.Dataset >= 0) { var date = item.DateCreated.replace(/\//g, "").replace('Date', " ").replace('(', "").replace(')', ""); arrObject[parseInt(date)].push($(parseFloat(item.Dataset))); } });

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