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function sum(a, b) {
   console.log(this === window); // => true
   this.myNumber = 20; // add 'myNumber' property to global object
   return a + b;
}
// sum() is invoked as a function
// this in sum() is a global object (window)
console.log(sum(15, 16));     // => 31
console.log(window.myNumber); // => 20
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