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  • The valueOf() Method

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    In Javascript ,valueOf() method is used to wrapped the primitive value of a String object .And this method is automatically call by javascript (from backend ).
    Syntax :

    stringobj.valuOf( ) // There is no parameter .
    

    In Javascript , this method is used to convert an object to a primitive value and javascript automatically call this method after invoke the valueOf method by user.(when there is primitive value is expected ).By default , this method is inherited by every object form Object .If an object has no primitive value , then this method return the object itself like : [Object Object]
    You can override this method by your own method (by calling your custom method instead of the default Object method ).
    Example :

    myNameType.prototype.valuOf = function ( ) { return customPrimitiveValue ; } ;
    myName.valueOf( ); // To call your custom method(override the object valueOf method ) ;
    

    Example of valueOf() method :
    name = new Object ( ) ;
    myname = name.valueOf ( ) ; [ Object Object ]
    Another example :
    without valueOf method

    var fruit = new fruit(5);<br>
    document.write(typeof fruit);//it will return object
    

    with valueOf method

    var fruit = new fruit (5);<br>
    var name = fruit.valueof( );<br>
    document.write(name); // 10<br>
    document.write(typeof name); // number
    

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