Dynamically build 2D array Javascript

Question

I want to build a 2 dimensional array dynamically, but I'm having trouble.

answers and votes (single string arrays) will always be the same length;

I need an array like this:

var data = 
        [['Answer', 'Votes'],
        [answers[0],  parseInt(votes[0])],
        [answers[1],  parseInt(votes[1])],
        [answers[2],  parseInt(votes[2])],
          ....
        ];

This doesn't work;

var data[];
var arrayLength = answers.length;
for (var i = 0; i < arrayLength; i++) {
    data += [answers[i], votes[i]]; //**Maybe the only line that needs tweaking?
}

does answers array has the same length with the votes array? — Jesse
– Jesse, Commented Mar 6, 2015 at 6:04

dsharew · Accepted Answer · 2015-03-06 15:48:29Z

1

Try this:

var data = [];

data[0] = ['answers','votes']

var arrayLength = answers.length;
for (var i = 0; i < arrayLength; i++) {
    data[i+1]= [answers[i], parseInt(votes[i])]; 
}

//check
console.table(data)

edited Mar 6, 2015 at 15:48

answered Mar 6, 2015 at 6:03

dsharew

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Comments

Xlander · Accepted Answer · 2015-03-06 06:10:21Z

1

var data = [];
var arrayLength = answers.length;
data[0] = ['Answer', 'Votes'];
for (var i = 1; i < arrayLength; i++) {
    data.push([answers[i], votes[i]]); /*It's not += but .push()*/
}

edited Mar 6, 2015 at 6:10

answered Mar 6, 2015 at 6:03

Xlander

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2 Comments

Xlander Over a year ago

Ah yeah. I've missed it. Thanks for the notice.

Colbs Over a year ago

he copied off my bad declaration ;) .. Thanks @Xlander

David O'Rand Hasenjaeger · Accepted Answer · 2015-03-06 06:07:42Z

0

Try this:

var data = [];
var arrayLength = answers.length;
for (var i = 0; i < arrayLength; i++) {
    data.push([answers[i], votes[i]]);
}

answered Mar 6, 2015 at 6:07

David O'Rand Hasenjaeger

363 bronze badges

Comments

Sarmin Akter · Accepted Answer · 2015-03-06 09:04:14Z

0

Since you wrote answers [i] and votes[i] so, it seems your answers and votes are in two different array. so why the loop is needed.

Suppose answers and votes are:

var answers = ["A", "B", "C", "D", "E", "F"];
var votes = ["1", "2", "3", "4", "5", "6"];

building new array

var data = ["Answers", "Votes"];

data.Answers=answers;
data.Votes=votes;

console.log(data);

edited Mar 6, 2015 at 9:04

answered Mar 6, 2015 at 8:53

Sarmin Akter

1207 bronze badges

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