var SetLayerCollisionIndex = function (tileIndex, collides, layer){ 
var loc = layer.collideIndexes.indexOf(tileIndex); 
if (collides && loc === -1) { 
layer.collideIndexes.push(tileIndex); 
} 
 else if (!collides && loc !== -1) { 
layer.collideIndexes.splice(loc, 1); 
} 
} 
; 
module.exports = SetLayerCollisionIndex;