Difference between “value.toString” and “value.toString()”












1















somewhere when I was going through a piece code I saw a line and I could not find any proper explanation of it on the internet.



value.toString and value.toString()


please if anyone could help me with the difference between the above two?






javascript







share|improve this question




















  • 1





    The first statement verifies that value has a truthy value for its toString property and the second statement attempts to execute it as a function.

    – André Dion
    Nov 23 '18 at 11:43











  • @RıdvanSumset, huh?

    – André Dion
    Nov 23 '18 at 11:45











  • toString() is a method to convert a value to string. there is no such thing toString. maybe it's a property (or a method) under an object in your code.

    – Rıdvan Sumset
    Nov 23 '18 at 11:45













  • @AndréDion I edited my comment to make it clearer for you.

    – Rıdvan Sumset
    Nov 23 '18 at 11:51
















1















somewhere when I was going through a piece code I saw a line and I could not find any proper explanation of it on the internet.



value.toString and value.toString()


please if anyone could help me with the difference between the above two?






javascript







share|improve this question




















  • 1





    The first statement verifies that value has a truthy value for its toString property and the second statement attempts to execute it as a function.

    – André Dion
    Nov 23 '18 at 11:43











  • @RıdvanSumset, huh?

    – André Dion
    Nov 23 '18 at 11:45











  • toString() is a method to convert a value to string. there is no such thing toString. maybe it's a property (or a method) under an object in your code.

    – Rıdvan Sumset
    Nov 23 '18 at 11:45













  • @AndréDion I edited my comment to make it clearer for you.

    – Rıdvan Sumset
    Nov 23 '18 at 11:51














1












1








1








somewhere when I was going through a piece code I saw a line and I could not find any proper explanation of it on the internet.



value.toString and value.toString()


please if anyone could help me with the difference between the above two?






javascript







share|improve this question
















somewhere when I was going through a piece code I saw a line and I could not find any proper explanation of it on the internet.



value.toString and value.toString()


please if anyone could help me with the difference between the above two?






javascript




javascript






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 23 '18 at 12:11









elegant-user

1,86641434




1,86641434










asked Nov 23 '18 at 11:40









Divya SinghDivya Singh

144




144








  • 1





    The first statement verifies that value has a truthy value for its toString property and the second statement attempts to execute it as a function.

    – André Dion
    Nov 23 '18 at 11:43











  • @RıdvanSumset, huh?

    – André Dion
    Nov 23 '18 at 11:45











  • toString() is a method to convert a value to string. there is no such thing toString. maybe it's a property (or a method) under an object in your code.

    – Rıdvan Sumset
    Nov 23 '18 at 11:45













  • @AndréDion I edited my comment to make it clearer for you.

    – Rıdvan Sumset
    Nov 23 '18 at 11:51














  • 1





    The first statement verifies that value has a truthy value for its toString property and the second statement attempts to execute it as a function.

    – André Dion
    Nov 23 '18 at 11:43











  • @RıdvanSumset, huh?

    – André Dion
    Nov 23 '18 at 11:45











  • toString() is a method to convert a value to string. there is no such thing toString. maybe it's a property (or a method) under an object in your code.

    – Rıdvan Sumset
    Nov 23 '18 at 11:45













  • @AndréDion I edited my comment to make it clearer for you.

    – Rıdvan Sumset
    Nov 23 '18 at 11:51








1




1





The first statement verifies that value has a truthy value for its toString property and the second statement attempts to execute it as a function.

– André Dion
Nov 23 '18 at 11:43





The first statement verifies that value has a truthy value for its toString property and the second statement attempts to execute it as a function.

– André Dion
Nov 23 '18 at 11:43













@RıdvanSumset, huh?

– André Dion
Nov 23 '18 at 11:45





@RıdvanSumset, huh?

– André Dion
Nov 23 '18 at 11:45













toString() is a method to convert a value to string. there is no such thing toString. maybe it's a property (or a method) under an object in your code.

– Rıdvan Sumset
Nov 23 '18 at 11:45







toString() is a method to convert a value to string. there is no such thing toString. maybe it's a property (or a method) under an object in your code.

– Rıdvan Sumset
Nov 23 '18 at 11:45















@AndréDion I edited my comment to make it clearer for you.

– Rıdvan Sumset
Nov 23 '18 at 11:51





@AndréDion I edited my comment to make it clearer for you.

– Rıdvan Sumset
Nov 23 '18 at 11:51












4 Answers
4






active

oldest

votes


















0














There is nothing Like "toString" in javascript.
Whereas the function toString() is used to convert value into the String value.



var a = 10;

a.toString();

// Here a will be converted into String ("10")





share|improve this answer
























  • “There is nothing Like "toString" in javascript. Whereas the function toString() [...]” - both are the same thing - foo.bar just references a method bar of the foo object, whereas foo.bar() would call the method.

    – misorude
    Nov 23 '18 at 11:52











  • toString returns the defination of the method. whereas toString() is a method of the Object Class

    – aditya agnihotri
    Nov 23 '18 at 12:33



















0














This statement



value.toString


checks whether the variable value has a property named toString. This statement



value.toString()


retrieves the property named toString and invokes it as a method of value.



I suppose the intention here is to avoid exceptions in case the value lacks a toString method:



// If the value has a toString method, invoke it:

value.toString && value.toString()


(Note that I replaced and with the && operator.)



Normally, every JavaScript value will have a toString method (even numbers and Booleans!), so this extra test is unnecessary. Hypothetically one could construct an object where the toString property is explicitly erased:



var value = { toString: undefined };


and in this case, it would make sense to test for the existence of toString before attempting to invoke it.






share|improve this answer































    0














    value.toString() -> It will convert any value to string and return that value.



    value.toString -> It will work as a primitive value and it will create an object wrapper. That's why it will not give any error or warning instead it will return a reference to the toString method.



    So in short value.toSting() will return a string and value.toString will return a reference to the toString method.






    share|improve this answer


























    • “and value.toString will return an undefined” - no, it will return a reference to the toString method.

      – misorude
      Nov 23 '18 at 11:53











    • Yes you are right it will return a reference to the toString method

      – Kunal
      Nov 23 '18 at 11:55



















    0














    The value.toString is a function in JavaScript which can be used
    as
    value.toString()



    If write and test value.toString in console you see below.



    ƒ toString() { [native code] }






    share|improve this answer


























    • nope, value.toString() do not return that but toString does.

      – Rıdvan Sumset
      Nov 23 '18 at 12:01











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    4 Answers
    4






    active

    oldest

    votes








    4 Answers
    4






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    0














    There is nothing Like "toString" in javascript.
    Whereas the function toString() is used to convert value into the String value.



    var a = 10;
    
a.toString();
    
// Here a will be converted into String ("10")





    share|improve this answer
























    • “There is nothing Like "toString" in javascript. Whereas the function toString() [...]” - both are the same thing - foo.bar just references a method bar of the foo object, whereas foo.bar() would call the method.

      – misorude
      Nov 23 '18 at 11:52











    • toString returns the defination of the method. whereas toString() is a method of the Object Class

      – aditya agnihotri
      Nov 23 '18 at 12:33
















    0














    There is nothing Like "toString" in javascript.
    Whereas the function toString() is used to convert value into the String value.



    var a = 10;
    
a.toString();
    
// Here a will be converted into String ("10")





    share|improve this answer
























    • “There is nothing Like "toString" in javascript. Whereas the function toString() [...]” - both are the same thing - foo.bar just references a method bar of the foo object, whereas foo.bar() would call the method.

      – misorude
      Nov 23 '18 at 11:52











    • toString returns the defination of the method. whereas toString() is a method of the Object Class

      – aditya agnihotri
      Nov 23 '18 at 12:33














    0












    0








    0







    There is nothing Like "toString" in javascript.
    Whereas the function toString() is used to convert value into the String value.



    var a = 10;
    
a.toString();
    
// Here a will be converted into String ("10")





    share|improve this answer













    There is nothing Like "toString" in javascript.
    Whereas the function toString() is used to convert value into the String value.



    var a = 10;
    
a.toString();
    
// Here a will be converted into String ("10")






    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered Nov 23 '18 at 11:49









    aditya agnihotriaditya agnihotri

    1




    1













    • “There is nothing Like "toString" in javascript. Whereas the function toString() [...]” - both are the same thing - foo.bar just references a method bar of the foo object, whereas foo.bar() would call the method.

      – misorude
      Nov 23 '18 at 11:52











    • toString returns the defination of the method. whereas toString() is a method of the Object Class

      – aditya agnihotri
      Nov 23 '18 at 12:33



















    • “There is nothing Like "toString" in javascript. Whereas the function toString() [...]” - both are the same thing - foo.bar just references a method bar of the foo object, whereas foo.bar() would call the method.

      – misorude
      Nov 23 '18 at 11:52











    • toString returns the defination of the method. whereas toString() is a method of the Object Class

      – aditya agnihotri
      Nov 23 '18 at 12:33

















    “There is nothing Like "toString" in javascript. Whereas the function toString() [...]” - both are the same thing - foo.bar just references a method bar of the foo object, whereas foo.bar() would call the method.

    – misorude
    Nov 23 '18 at 11:52





    “There is nothing Like "toString" in javascript. Whereas the function toString() [...]” - both are the same thing - foo.bar just references a method bar of the foo object, whereas foo.bar() would call the method.

    – misorude
    Nov 23 '18 at 11:52













    toString returns the defination of the method. whereas toString() is a method of the Object Class

    – aditya agnihotri
    Nov 23 '18 at 12:33





    toString returns the defination of the method. whereas toString() is a method of the Object Class

    – aditya agnihotri
    Nov 23 '18 at 12:33













    0














    This statement



    value.toString


    checks whether the variable value has a property named toString. This statement



    value.toString()


    retrieves the property named toString and invokes it as a method of value.



    I suppose the intention here is to avoid exceptions in case the value lacks a toString method:



    // If the value has a toString method, invoke it:
    
value.toString && value.toString()


    (Note that I replaced and with the && operator.)



    Normally, every JavaScript value will have a toString method (even numbers and Booleans!), so this extra test is unnecessary. Hypothetically one could construct an object where the toString property is explicitly erased:



    var value = { toString: undefined };


    and in this case, it would make sense to test for the existence of toString before attempting to invoke it.






    share|improve this answer




























      0














      This statement



      value.toString


      checks whether the variable value has a property named toString. This statement



      value.toString()


      retrieves the property named toString and invokes it as a method of value.



      I suppose the intention here is to avoid exceptions in case the value lacks a toString method:



      // If the value has a toString method, invoke it:
      
value.toString && value.toString()


      (Note that I replaced and with the && operator.)



      Normally, every JavaScript value will have a toString method (even numbers and Booleans!), so this extra test is unnecessary. Hypothetically one could construct an object where the toString property is explicitly erased:



      var value = { toString: undefined };


      and in this case, it would make sense to test for the existence of toString before attempting to invoke it.






      share|improve this answer


























        0












        0








        0







        This statement



        value.toString


        checks whether the variable value has a property named toString. This statement



        value.toString()


        retrieves the property named toString and invokes it as a method of value.



        I suppose the intention here is to avoid exceptions in case the value lacks a toString method:



        // If the value has a toString method, invoke it:
        
value.toString && value.toString()


        (Note that I replaced and with the && operator.)



        Normally, every JavaScript value will have a toString method (even numbers and Booleans!), so this extra test is unnecessary. Hypothetically one could construct an object where the toString property is explicitly erased:



        var value = { toString: undefined };


        and in this case, it would make sense to test for the existence of toString before attempting to invoke it.






        share|improve this answer













        This statement



        value.toString


        checks whether the variable value has a property named toString. This statement



        value.toString()


        retrieves the property named toString and invokes it as a method of value.



        I suppose the intention here is to avoid exceptions in case the value lacks a toString method:



        // If the value has a toString method, invoke it:
        
value.toString && value.toString()


        (Note that I replaced and with the && operator.)



        Normally, every JavaScript value will have a toString method (even numbers and Booleans!), so this extra test is unnecessary. Hypothetically one could construct an object where the toString property is explicitly erased:



        var value = { toString: undefined };


        and in this case, it would make sense to test for the existence of toString before attempting to invoke it.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 23 '18 at 11:55









        Pedro LMPedro LM

        45727




        45727























            0














            value.toString() -> It will convert any value to string and return that value.



            value.toString -> It will work as a primitive value and it will create an object wrapper. That's why it will not give any error or warning instead it will return a reference to the toString method.



            So in short value.toSting() will return a string and value.toString will return a reference to the toString method.






            share|improve this answer


























            • “and value.toString will return an undefined” - no, it will return a reference to the toString method.

              – misorude
              Nov 23 '18 at 11:53











            • Yes you are right it will return a reference to the toString method

              – Kunal
              Nov 23 '18 at 11:55
















            0














            value.toString() -> It will convert any value to string and return that value.



            value.toString -> It will work as a primitive value and it will create an object wrapper. That's why it will not give any error or warning instead it will return a reference to the toString method.



            So in short value.toSting() will return a string and value.toString will return a reference to the toString method.






            share|improve this answer


























            • “and value.toString will return an undefined” - no, it will return a reference to the toString method.

              – misorude
              Nov 23 '18 at 11:53











            • Yes you are right it will return a reference to the toString method

              – Kunal
              Nov 23 '18 at 11:55














            0












            0








            0







            value.toString() -> It will convert any value to string and return that value.



            value.toString -> It will work as a primitive value and it will create an object wrapper. That's why it will not give any error or warning instead it will return a reference to the toString method.



            So in short value.toSting() will return a string and value.toString will return a reference to the toString method.






            share|improve this answer















            value.toString() -> It will convert any value to string and return that value.



            value.toString -> It will work as a primitive value and it will create an object wrapper. That's why it will not give any error or warning instead it will return a reference to the toString method.



            So in short value.toSting() will return a string and value.toString will return a reference to the toString method.







            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Nov 23 '18 at 11:56

























            answered Nov 23 '18 at 11:52









            KunalKunal

            16710




            16710













            • “and value.toString will return an undefined” - no, it will return a reference to the toString method.

              – misorude
              Nov 23 '18 at 11:53











            • Yes you are right it will return a reference to the toString method

              – Kunal
              Nov 23 '18 at 11:55



















            • “and value.toString will return an undefined” - no, it will return a reference to the toString method.

              – misorude
              Nov 23 '18 at 11:53











            • Yes you are right it will return a reference to the toString method

              – Kunal
              Nov 23 '18 at 11:55

















            “and value.toString will return an undefined” - no, it will return a reference to the toString method.

            – misorude
            Nov 23 '18 at 11:53





            “and value.toString will return an undefined” - no, it will return a reference to the toString method.

            – misorude
            Nov 23 '18 at 11:53













            Yes you are right it will return a reference to the toString method

            – Kunal
            Nov 23 '18 at 11:55





            Yes you are right it will return a reference to the toString method

            – Kunal
            Nov 23 '18 at 11:55











            0














            The value.toString is a function in JavaScript which can be used
            as
            value.toString()



            If write and test value.toString in console you see below.



            ƒ toString() { [native code] }






            share|improve this answer


























            • nope, value.toString() do not return that but toString does.

              – Rıdvan Sumset
              Nov 23 '18 at 12:01
















            0














            The value.toString is a function in JavaScript which can be used
            as
            value.toString()



            If write and test value.toString in console you see below.



            ƒ toString() { [native code] }






            share|improve this answer


























            • nope, value.toString() do not return that but toString does.

              – Rıdvan Sumset
              Nov 23 '18 at 12:01














            0












            0








            0







            The value.toString is a function in JavaScript which can be used
            as
            value.toString()



            If write and test value.toString in console you see below.



            ƒ toString() { [native code] }






            share|improve this answer















            The value.toString is a function in JavaScript which can be used
            as
            value.toString()



            If write and test value.toString in console you see below.



            ƒ toString() { [native code] }







            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Nov 23 '18 at 12:10

























            answered Nov 23 '18 at 11:55









            elegant-userelegant-user

            1,86641434




            1,86641434













            • nope, value.toString() do not return that but toString does.

              – Rıdvan Sumset
              Nov 23 '18 at 12:01



















            • nope, value.toString() do not return that but toString does.

              – Rıdvan Sumset
              Nov 23 '18 at 12:01

















            nope, value.toString() do not return that but toString does.

            – Rıdvan Sumset
            Nov 23 '18 at 12:01





            nope, value.toString() do not return that but toString does.

            – Rıdvan Sumset
            Nov 23 '18 at 12:01


















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