Javascript: split string into 2d array - Stack Overflow

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I have a string of month and years:

var months= "2010_1,2010_3,2011_4,2011_7";

I want to make this into a 2d array with the year in the first position of each array and the month in the second position. In other words, I want to end up with this:

var monthArray2d = [[2010,1],[2010,3][2011,4],[2011,7]];

The way I do this currently is:

//array of selected months
var monthArray = months.split(",");

//split each selected month into [year, month] array
var monthArray2d = new Array();
for (var i = 0; i < monthArray.length; i++) {
    monthArray2d[i] = monthArray[i].split("_");

Is there a way to condense that code so that I never need to use the monthArray var?

I have a string of month and years:

var months= "2010_1,2010_3,2011_4,2011_7";

I want to make this into a 2d array with the year in the first position of each array and the month in the second position. In other words, I want to end up with this:

var monthArray2d = [[2010,1],[2010,3][2011,4],[2011,7]];

The way I do this currently is:

//array of selected months
var monthArray = months.split(",");

//split each selected month into [year, month] array
var monthArray2d = new Array();
for (var i = 0; i < monthArray.length; i++) {
    monthArray2d[i] = monthArray[i].split("_");

Is there a way to condense that code so that I never need to use the monthArray var?

• javascript
• arrays
• string
• multidimensional-array
• split

Share Improve this question Follow asked Dec 21, 2011 at 17:49 dmrdmr 22.3k3737 gold badges104104 silver badges139139 bronze badges

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4 Answers 4

Sorted by: Reset to default 12

You can use replace to get more compact code:

var months= "2010_1,2010_3,2011_4,2011_7";
var monthArray2d = []

months.replace(/(\d+)_(\d+)/g, function($0, $1, $2) {
    monthArray2d.push([parseInt($1), parseInt($2)]);
})

or map if your target browser supports it:

monthArray2d = months.split(",").map(function(e) {
    return e.split("_").map(Number);
})

Basically, the first function looks for year/month patterns "digits underscore digits", and stores each found substring in an array. Of course, you can use other delimiters instead of underscore. The function doesn't care about the values' delimiter (comma), so that it can be whatever. Example:

var months= "2010/1 ... 2010/3 ... 2011/4";
months.replace(/(\d+)\/(\d+)/g, function($0, $1, $2) {
    monthArray2d.push([parseInt($1), parseInt($2)]);
})

If condensed is what you're after:

var month_array = months.split(",").map(function(x){return x.split("_")});

JavaScript is another dynamic language and its variable type allows you to keep anything wherever you like. You did the split right, now just split that string with _ and put it back in there.

See this example:

var months= "2010_1,2010_3,2011_4,2011_7";

var monthArray = months.split(",");

for (var i = 0; i < monthArray.length; i++) {
   monthArray[i] = monthArray[i].split("_");
}

console.log(monthArray);

I don't know what you mean by not to use monthArray. The code above is the least you can do, probably!

Splitting each split is a sensible thing to do- you can use a regular expression to match the underscore separated numbers, and insert each pair in its own array pushed to the month array-

but I don't see an improvement over your code:

var s= "2010_1,2010_3,2011_4,2011_7",

A= [], rx=/(\d+)_(\d+)/g;

while((M= rx.exec(s))!= null){
    A.push([M[1], M[2]]);
}


/*  returned value: (Array)
[[2010,1],[2010,3],[2011,4],[2011,7]]
*/

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