I would like to know how to declare 2 dimensional arrays in java script of fixed lengths something like,
var array = new Array[this.rows, this.columns]; after that I would like to get the length of each dimension like,
array[0].length; // I am assuming this would give me the first dimension like in C# array.GetLength(0); array[1].length; // I am assuming this would give me the second dimension like in C# array.GetLength(1); A quick example of what @SLaks is referring to with jagged arrays. You basically put an array in an array. The below example shows one way to make an array thats 100x100.
var arr = []; for(var x = 0; x < 100; x++){ arr[x] = []; for(var y = 0; y < 100; y++){ arr[x][y] = x*y; } } console.log(arr[10][11]); This method is very flexible for instance arr[4] could have an array indexed to 10, and arr[5] could have an array with 1 value, or be even be a completely different type such as a string or number.
arr.length, and arr[0].length. That would be the "width" and "height"
var array = Array(y).fill().map(entry => Array(x)) //x = number of column //y= number of rowA nested 3x3 array (of undefined):
var arr = new Array(3); for (var i = 0; i < arr.length; ++i) { arr[i] = new Array(3); } console.log(arr);modle13 commented that you're restricted to a fixed size sub-array, so here's one quick tweak to get around that:
var nestedSizes = [3,5,1,4]; var arr = new Array(nestedSizes.length); for (var i = 0; i < arr.length; ++i) { arr[i] = new Array(nestedSizes[i]); } console.log(arr);Unlike C#, Javascript does not support multi-dimensional arrays.
Instead, you can use nested ("jagged") arrays.
In javascript:
var Matrix = function (rows, columns) { this.rows = rows; this.columns = columns; this.myarray = new Array(this.rows); for (var i=0; i < this.columns; i +=1) { this.myarray[i]=new Array(this.rows) } return this.myarray; } var m = new Matrix(2,2); m; // [[undefined, undefined], [undefined, undefined]]; var m2 = new Matrix(3,3); m2; // [[undefined, undefined, undefined], [undefined, undefined, undefined], [undefined, undefined, undefined]] 
could you not just do something like this?
var x = new Array(4); #1st array, array of arrays y = new Array(1, 4, 2, 0); #2nd dimension of arrays, an array of values z = new Array(4, 8, 3, 9); #^^^ a = new Array(7, 0, 2, 4); #^^^ t = new Array(9, 0, 3, 1); #^^^ then to access 7 (the 1st value) in array a (3) you could type:
var example = x.3.1 if this wont work please tell me cos this is what i was told and what im now using to program my game
