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

1,83641334




1,83641334










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

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    4 Answers
    4






    active

    oldest

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    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

        43727




        43727























            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

            1699




            1699












            • “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

            1,83641334




            1,83641334












            • 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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