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var A = function() {
this.a = [];
}
A.prototype.hello = function() {
console.log('Hello from A!');
}
var B = function(a) {
if (a) {
this.a = a;
}
}
B.prototype = new A();
var b = new B();
var c = new B();
b.a.push('hello');
console.log(c.a); //['hello']
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