Javascript find adjacencies -


i have "class" called block. possesses 3 variables : x, y, , z, three-dimensional coordinates, respectively. having trouble finding number of "neighbours" block. is, if this shares face, edge, or vertex other, should return true. so, block.neighbours() returns number of neighbours block. however, returning 0 rather expected 1. code shown below:

var blocks = [];    function block(x, y, z) {     blocks.push(this);     this.x = x;     this.y = y;     this.z = z;     this.neighbours = function() {       var n = 0;       (var block in blocks) {         if (block == this) {           continue;         }         if (math.abs(block.x - this.x) <= 1 && math.abs(block.y - this.y) <= 1 && math.abs(block.z - this.z) <= 1) {           n++;         }       }       return n;     };   }    var b1 = new block(0, 0, 0);   var b2 = new block(0, 1, 0);   document.getelementbyid("box").innerhtml = b1.neighbours();

why function returning 0? (note: before javascript have html <p id = "box"></p>, , in paragraph shows 0).

the bug in code for (var block in blocks) { not iterating expect -- var block in blocks iterates on property names 0 , 1 demonstrated here:

http://jsfiddle.net/yxzobjhb/

you fix doing this:

    (var blockkey in blocks) {         var block = blocks[blockkey];

jsfiddle: http://jsfiddle.net/yxzobjhb/2/

another way fix write this:

var blocks = [];  function block(x, y, z) {     blocks.push(this);     this.x = x;     this.y = y;     this.z = z;     this.neighbours = function() {         var n = 0;         blocks.foreach(function(block) {             if (block != && math.abs(block.x - this.x) <= 1 && math.abs(block.y - this.y) <= 1 && math.abs(block.z - this.z) <= 1) {                 n++;             }         }, this);         return n;     }; }  var b1 = new block(0, 0, 0); var b2 = new block(0, 1, 0); document.getelementbyid("box").innerhtml = b1.neighbours();

jsfiddle: http://jsfiddle.net/jlxw316c/2/


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