@Bondye: That's part of the strange design of javascript. In this case object["property"] is not exactly the same as array[4] , the former wasn't created ... ... <看更多>

Object Property types ... JavaScript specifies characteristics of properties of objects via internal attributes surrounded by the two pair of square brackets e.g. ... ... <看更多>

This tutorial explains - How to dynamically add properties in a JavaScript object array. ... <看更多>

Defining properties for an object type. You can add a property to a previously defined object type by using ... ... <看更多>

push(newCol) , I get an error because the record.columns is a Javascript Object and not an Array/Map. I have tried to parse the object to an ... ... <看更多>