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Not able to call object method after retrieving from array

I have created on class say 'Example' with 2 methods in it.
Then I created array of objects of that class.
In for loop I tried to access one object at a time and call one of its method and i got exception on that 'undefined is not a method'.

var cls = require('node-cls');

var Example = cls.defineClass({
    name: Example,
    construct: function() {
        this.a = 10
    },
    methods: {
        getA: function() {
            return this.a;
        }
    },
    variables: {
        a: null
    }
});

//In some function

function testObject() {
    var objArray = new Array();
    objArray.push(new Example());
    objArray.push(new Example());
    objArray.push(new Example());

    for(var obj in objArray) {
        objArray[obj].getA();  //undefined is not a function
    }
}

But if I try to check methods of that class from the object then it works fine and shows me 'getA' is a method from that class,

function testObject() {
    var objArray = new Array();
    objArray.push(new Example());
    objArray.push(new Example());
    objArray.push(new Example());

    for(var obj in objArray) {
        objArray[obj].getA();  //undefined is not a function
        console.log(slotObj.getClass().getMethods());  //name: getA , method: [Function]
    }
}

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