I am trying to convert Java code to Javascript and I am trying to assign data to 3 dimensional array and I am getting "TypeError: can't convert undefined to object " error. Following is my code. Thanks in advance for any help.
var initData = [[2], [12], [2]];
for (var i = 0; i < 12; i++)
{
initData[0][i][0] = -1;
initData[0][i][1] = -1;
initData[1][i][0] = -1;
initData[1][i][1] = -1;
}
[[2], [12], [2]];
That's not a declaration of dimensions, that's four array literals. There are no multidimensional arrays in JS. They're just one-dimensional lists that can contain arbitrary values (including other lists).
To create and fill an array that contains other arrays you have to use the following:
var initData = []; // an empty array
for (var i = 0; i < 2; i++) {
initData[i] = []; // that is filled with arrays
for (var j = 0; j < 12; j++) {
initData[i][j] = []; // which are filled with arrays
for (var k = 0; k < 2; k++) {
initData[i][j][k] = -1; // which are filled with numbers
}
}
}
or, to apply your loop unrolling:
var initData = [[], []]; // an array consisting of two arrays
for (var i = 0; i < 12; i++) {
// which each are filled with arrays that consist of two numbers
initData[0][i] = [-1, -1];
initData[1][i] = [-1, -1];
}
initData is a list of three lists, [2], [12] and [2]. Each one with one element.
In order to init a list(or array), you must do
var initData = [];
Then store in initData another list, like initData[0] = [] and so on... like it's mentioned, arrays/lists in javascript aren't initialized with a limit size.
initDatais a 2 dimentional array of arrays, each of those arrays has a single cell. I don't think this is what you meant.