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What will be the output of the of following code:

console.log({}.valueOf()+15);//Output:[object Object]15

Will the return value from the .valueOf() method be string in the above code or is simply an object since .toString() will result in same but with this method returned value will be string anyhow.I just wanted to know what will be the type of the value the .valueOf() returns in above code.If return value is a string ,for what other object will valueOf() method returns string value except for [new String("abc")]

Answer:1

valueOf returns a primitive value. Exactly what type of primitive value depends on the object.

To demonstrate:

typeof Number(0).valueOf(); // number
typeof Boolean(0).valueOf(); // boolean

The point is that, whatever it returns, it is a primitive value. toString, on the other hand, always returns a string.

In the case of {}, there is no valueOf method other than the root Object.prototype.valueOf, which is identical to Object.prototype.toString, returning a string of the form [object Constructor]. Which being a string results in concatenation with 15.

Answer:2

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