Question

Hello i have this method:

    private function  findConnectedNodes(node:Node):Array{
    var test_node:Node;
    var surrounding_nodes:Array = [];
    for(var i:uint = 0;i <= nodes.length; i++){
        test_node = this.nodes[i]; // contains an array of Node objects

        if (test_node.row < node.row - 1 || test_node.row > node.row + 1) continue;
        if (test_node.column < node.column - 1 || test_node.column > node.column + 1) continue;
        surrounding_nodes.push(test_node)

    }
    return surrounding_nodes;

}

I am getting this error: Cannot access a property or method of a null object reference. This error is appearing on the if statement.

I think this is due to the test_node variable, as flex debug shows me that test_node is NULL. Not sure why this is, as you can clearly see I am assigning objects in the array to test_node.

If I change test_node = this.nodes[i]; to test_node = this.nodes[<enter a number>] the program works

Answer 1

i <= nodes.length

Shouldn’t it be i < nodes.length? This way you’ll get null node on last step.