Closure III | Advanced Javascript (beta), Hacker Hero

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Design function Library such that the following codes would work.

$ = new Library(10); // initialize the base as 10
var x = $.add(3,5);  // x should be 18
var y = $.add(5,10); // y should be 33
var z = $.add(10);     // x should be 43

Note that this is not the same as the previous challenge. This time, it remembers what was added before and adds more numbers each time add method is called.

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x to return 18
y to return 33
z to return 43

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