testCallProtoMethod.js

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function testCallProtoMethod() {

    function X() { this.x = 1; }

    X.prototype.getName = function () { return "X"; }

    function Y() { this.x = 2; }

    Y.prototype.getName = function() { return "Y"; };

    var a = [new X, new X, new X, new X, new Y];

    var s = '';

    for (var i = 0; i < a.length; i++)

        s += a[i].getName();

    return s;

assertEq(testCallProtoMethod(), 'XXXXY');