Creating array of arrays with JavaScript

Question

I have the following code, which when run gives error: TypeError: Cannot read property 'split' of undefined
Here you can run it.

var myData = "some1,some2,some3\nsome4,some5,some6\nsome7,some8,some9";
var arrayed = myData.split('\n');
var columns = arrayed.length;
var urlArray = new Array(columns);
console.log(arrayed);
var newarrayed = arrayed.split(',');
console.log(newarrayed);

I have myData array, I want to convert it to an array of arrays, splitting first at \n to seperate arrays, and second at , to create the items inside the arrays. so this list would be like:

[[data1, data2, data3], [data4, data5, data6], [data7, data8, data9]]

console.log(arrayed); does something similar, but when I try to access it using arrayed[0][0], it gives me just the first letter.

What error? Please include all pertinent information in your question — James Thorpe
– James Thorpe, Commented Jan 5, 2015 at 23:00
Stack offers runnable snippets now, you should use that instead of that weird fiddle like website — Sterling Archer
– Sterling Archer, Commented Jan 5, 2015 at 23:01
Also consider cleaning up your code samples before posting them; we don't need those random commented-out bits at the bottom. — AstroCB
– AstroCB, Commented Jan 5, 2015 at 23:06

Joseph Marikle · Accepted Answer · 2015-01-05 23:02:13Z

4

You're not splitting the strings correctly. You try to split them twice, but the second time fails because you are calling split on an array, not a string. Try looping over them instead.

var myData = "some1,some2,some3\nsome4,some5,some6\nsome7,some8,some9";
var arrayed = myData.split('\n');
var columns = arrayed.length;
var urlArray = new Array(columns);
console.log(arrayed);
var newarrayed = [];
for (var i in arrayed) {
    newarrayed.push(arrayed[i].split(','));
}
console.log(newarrayed);

answered Jan 5, 2015 at 23:02

Joseph Marikle

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1 Comment

Joseph Marikle Over a year ago

@Ugur You're welcome. Glad I could help. :) The push command just "pushes" another value onto the end of an array. You can also pop the value off again. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

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