copying one array to another array

Question

I am an array in following format. I am reading following data from a file data.json like this

$.getJSON('data/data.json', function (ids) {
            for (var i = 0; i < ids.length; i++) {
                var id = ids[i];
                teams = id;
                $('<li>' + id + '</li>').appendTo(span);

            }
        });

here is data

[
"109 200",
"109 201",
"102 202",
"103 202"
]

So what I want is to copy this array to another lets say c but in following form

[
"109",
"109",
"102",
"103",
"200",
"201",
"202",
"202"
]

How can I do this using javascript or jquery?

Ahmed's answer is the least amount of code and it is working. — Nope
– Nope, Commented Aug 15, 2012 at 11:20
@FrançoisWahl: No, the result is not in the order that OP requires. — João Silva
– João Silva, Commented Aug 15, 2012 at 11:57

João Silva · Accepted Answer · 2012-08-15 11:18:04Z

4

Iterate over the result set, split each element by whitespace, and add the resulting two numbers to two different arrays, each representing one halve, and finally, concatenate the left part with the right part:

var left = [], 
    right = [];
for (var i = 0; i < ids.length; i++) {
  var pair = ids[i].split(" ");
  left.push(pair[0]);
  right.push(pair[1]);
}
var result = left.concat(right);

edited Aug 15, 2012 at 11:18

answered Aug 15, 2012 at 11:06

João Silva

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2 Comments

HonkyTonk Over a year ago

It doesn't look like that will get the ordering OP wanted. With the edit, it does. ;)

HonkyTonk Over a year ago

No problem. I'm just too bad at ECMAScript to be able to supply the correct solution so I'm glad you could.

amd · Accepted Answer · 2012-08-16 06:01:08Z

3

simply use

ids.join(' ').split(' ');

Edit This will respect the order.

$.map(ids,function(i){ return i.split(' ')[0]; }).concat($.map(ids,function(i){ return i.split(' ')[1]; }))

edited Aug 16, 2012 at 6:01

answered Aug 15, 2012 at 11:10

amd

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2 Comments

Nope Over a year ago

+1 Very very nice and short solution. Seems to work just right keeping the order and splitting them up: jsfiddle.net/6rgd3

João Silva Over a year ago

But it doesn't keep the order that OP requires.

Paul Aldred-Bann · Accepted Answer · 2012-08-15 11:15:50Z

Although João has the correct method to do this, I noticed the order in which you wanted these elements adding to the array. To get what you state you're after, try this:

$.getJSON('data/data.json', function (ids) {
    var leftArray = new Array();
    var rightArray = new Array();

    for (var i = 0; i < ids.length; i++) {
        var splitted = ids[i].split(" ");

        if (splitted[0] !== null) {
            leftArray.push(splitted[0]);
        }

        if (splitted[1] !== null) {
            rightArray.push(splitted[1]);
        }
    }

    // now join the two arrays together to get your order
    var joinedArray = leftArray.conact(rightArray);

    // now build your elements with the data
    for (var i = 0; i < joinedArray.length; i++) {
        $('<li>' + joinedArray[i] + '</li>').appendTo(span);
    }
});

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