Question

I was implementing a routing algorithm in javascript, but when I assign a negative one variable in the array gives me this error: invalid array length.

var node = new Array()
node[0] = new Array(6,7)
node[1] = new Array(5,-4,8)
node[2] = new Array(-2) //Here, invalid array length

I do not know how to resolve this error.

Answer 1

If you are trying to initialize an array that contains only a negative number, use the literal syntax:

var a = [-2];

The problem with the Array constructor is that when it is invoked only with only one argument, this number is used as the length of the new array, e.g.:

var b = new Array(5);
b.length; // 5

I recommend you to stick with the literal syntax to avoid those ambiguities.