I have an array like this - (i do not know the length of this array in advance)
data: [[3, 1], [1, 1], [5, 1], [6, 1], [25, 1], [8, 2], [2, 3]]
how i can swap it so it becomes like this:
data: [[1, 3], [1, 1], [1, 5], [1, 6], [1, 25], [2, 8], [3, 2]]
Thanks!
Each element is an array, so you can apply reverse on it.
for(i = 0; i < data.length; i++) data[i].reverse();
var i, temp;
for(i = 0; i < data.length; i++) {
temp = data[i][0];
data[i][0] = data[i][1];
data[i][1] = temp;
}
var data = [[3, 1], [1, 1], [5, 1], [6, 1], [25, 1], [8, 2], [2, 3]];
data = data.map(function(x){ // loop though all elements
return x.reverse(); // reverse each array
});
Arary.map should work on all modern browsers (by that I mean you need Chrome, Firefox, Safari, Opera, or IE9+).
EDIT: Since Array.reverse will mutate the array, you can also do this:
var data = [[3, 1], [1, 1], [5, 1], [6, 1], [25, 1], [8, 2], [2, 3]];
data.forEach(function(x){ // loop though all elements
x.reverse(); // reverse each array
});
Array.forEach works in the same "moden" browsers, that .map works in.
.forEach is much slower than a normal for loop