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Merge pull request #2998 from OmerBaddour/master

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1-js/04-object-basics/09-object-toprimitive/article.md
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What happens when objects are added `obj1 + obj2`, subtracted `obj1 - obj2` or printed using `alert(obj)`? What happens when objects are added `obj1 + obj2`, subtracted `obj1 - obj2` or printed using `alert(obj)`?
JavaScript doesn't exactly allow to customize how operators work on objects. Unlike some other programming languages, such as Ruby or C++, we can't implement a special object method to handle an addition (or other operators). JavaScript doesn't allow you to customize how operators work on objects. Unlike some other programming languages, such as Ruby or C++, we can't implement a special object method to handle addition (or other operators).
In case of such operations, objects are auto-converted to primitives, and then the operation is carried out over these primitives and results in a primitive value. In case of such operations, objects are auto-converted to primitives, and then the operation is carried out over these primitives and results in a primitive value.