Structs in Javascript

Question

Previously  when I needed to store a number of related variables  I d create a class   function Item id  speaker  country        this id   id      this speaker   spkr      this country   country    var myItems         new Item 1   john    au        new Item 2   mary    us        But I m wondering if this is a good practice  Are there any other  better ways to simulate a struct in Javascript

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I always use object literals   id  1  speaker  john   country   au

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I always use object literals   id  1  speaker  john   country   au

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I use objects JSON style for dumb structs  no member functions

User · Answer

I always use object literals   id  1  speaker  john   country   au

User · Answer

I use objects JSON style for dumb structs  no member functions

User · Answer

I always use object literals   id  1  speaker  john   country   au

User · Answer

The only difference between object literals and constructed objects are the properties inherited from the prototype   var o        a   3   b   4     doStuff   function         alert this a   this b          o doStuff       displays  7     You could make a struct factory   function makeStruct names      var names   names split         var count   names length    function constructor         for  var i   0  i  lt  count  i            this names i     arguments i               return constructor     var Item   makeStruct  id speaker country    var row   new Item 1   john    au    alert row speaker      displays  john

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I think creating a class to simulate C-like structs  like you ve been doing  is the best way     It s a great way to group related data and simplifies passing parameters to functions  I d also argue that a JavaScript class is more like a C   struct than a C   class  considering the added effort needed to simulate real object oriented features      I ve found that trying to make JavaScript more like another language gets complicated fast  but I fully support using JavaScript classes as functionless structs

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Following Markus s answer  in newer versions of JS  ES6 I think  you can create a  struct  factory more simply using Arrow Functions and Rest Parameter like so   const Struct       keys    gt       v    gt  keys reduce  o  k  i    gt   o k    v i   return o         const Item   Struct  id    speaker    country   var myItems         Item 1   john    au        Item 2   mary    us       console log myItems   console log myItems 0  id   console log myItems 0  speaker   console log myItems 0  country     The result of running this is       id  1  speaker   john   country   au         id  2  speaker   mary   country   us      1 john au   You can make it look similar to Python s namedtuple   const NamedStruct    name     keys    gt       v    gt  keys reduce  o  k  i    gt   o k    v i   return o      name  name    const Item   NamedStruct  Item    id    speaker    country   var myItems         Item 1   john    au        Item 2   mary    us       console log myItems   console log myItems 0  id   console log myItems 0  speaker   console log myItems 0  country     And the results        name   Item   id  1  speaker   john   country   au          name   Item   id  2  speaker   mary   country   us      1 john au

User · Answer

It s more work to set up  but if maintainability beats one-time effort then this may be your case           class     class Reference                    constructs Reference         param  Object  p The properties          param  String  p class The class name          param  String  p field The field name              constructor p               this class   p class          this field   p field            Advantages    not bound to argument order easily extendable type script support

User · Answer

The only difference between object literals and constructed objects are the properties inherited from the prototype   var o        a   3   b   4     doStuff   function         alert this a   this b          o doStuff       displays  7     You could make a struct factory   function makeStruct names      var names   names split         var count   names length    function constructor         for  var i   0  i  lt  count  i            this names i     arguments i               return constructor     var Item   makeStruct  id speaker country    var row   new Item 1   john    au    alert row speaker      displays  john

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The real problem is that structures in a language are supposed to be value types not reference types   The proposed answers suggest using objects  which are reference types  in place of structures   While this can serve its purpose  it sidesteps the point that a programmer would actual want the benefits of using value types  like a primitive  in lieu of reference type   Value types  for one  shouldn t cause memory leaks

User · Answer

I think creating a class to simulate C-like structs  like you ve been doing  is the best way     It s a great way to group related data and simplifies passing parameters to functions  I d also argue that a JavaScript class is more like a C   struct than a C   class  considering the added effort needed to simulate real object oriented features      I ve found that trying to make JavaScript more like another language gets complicated fast  but I fully support using JavaScript classes as functionless structs

User · Answer

I made a small library to define struct if you work with ES6 compatibility   It is a JKT parser you may checkout the project repository here JKT Parser  For an example you may create your struct like this  const Person   jkt      name  String     age  Number    const someVar   Person   name   Aditya   age   26      someVar name    print  Aditya  someVar age    print 26  integer   someVar toJSON      produce json object with defined schema

User · Answer

The only difference between object literals and constructed objects are the properties inherited from the prototype   var o        a   3   b   4     doStuff   function         alert this a   this b          o doStuff       displays  7     You could make a struct factory   function makeStruct names      var names   names split         var count   names length    function constructor         for  var i   0  i  lt  count  i            this names i     arguments i               return constructor     var Item   makeStruct  id speaker country    var row   new Item 1   john    au    alert row speaker      displays  john

User · Answer

The only difference between object literals and constructed objects are the properties inherited from the prototype   var o        a   3   b   4     doStuff   function         alert this a   this b          o doStuff       displays  7     You could make a struct factory   function makeStruct names      var names   names split         var count   names length    function constructor         for  var i   0  i  lt  count  i            this names i     arguments i               return constructor     var Item   makeStruct  id speaker country    var row   new Item 1   john    au    alert row speaker      displays  john

User · Answer

Following Markus s answer  in newer versions of JS  ES6 I think  you can create a  struct  factory more simply using Arrow Functions and Rest Parameter like so   const Struct       keys    gt       v    gt  keys reduce  o  k  i    gt   o k    v i   return o         const Item   Struct  id    speaker    country   var myItems         Item 1   john    au        Item 2   mary    us       console log myItems   console log myItems 0  id   console log myItems 0  speaker   console log myItems 0  country     The result of running this is       id  1  speaker   john   country   au         id  2  speaker   mary   country   us      1 john au   You can make it look similar to Python s namedtuple   const NamedStruct    name     keys    gt       v    gt  keys reduce  o  k  i    gt   o k    v i   return o      name  name    const Item   NamedStruct  Item    id    speaker    country   var myItems         Item 1   john    au        Item 2   mary    us       console log myItems   console log myItems 0  id   console log myItems 0  speaker   console log myItems 0  country     And the results        name   Item   id  1  speaker   john   country   au          name   Item   id  2  speaker   mary   country   us      1 john au

User · Answer

I use objects JSON style for dumb structs  no member functions

User · Answer

I made a small library to define struct if you work with ES6 compatibility   It is a JKT parser you may checkout the project repository here JKT Parser  For an example you may create your struct like this  const Person   jkt      name  String     age  Number    const someVar   Person   name   Aditya   age   26      someVar name    print  Aditya  someVar age    print 26  integer   someVar toJSON      produce json object with defined schema

User · Answer

I use objects JSON style for dumb structs  no member functions

User · Answer

It s more work to set up  but if maintainability beats one-time effort then this may be your case           class     class Reference                    constructs Reference         param  Object  p The properties          param  String  p class The class name          param  String  p field The field name              constructor p               this class   p class          this field   p field            Advantages    not bound to argument order easily extendable type script support

User · Answer

The real problem is that structures in a language are supposed to be value types not reference types   The proposed answers suggest using objects  which are reference types  in place of structures   While this can serve its purpose  it sidesteps the point that a programmer would actual want the benefits of using value types  like a primitive  in lieu of reference type   Value types  for one  shouldn t cause memory leaks

[javascript] Structs in Javascript

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Examples related to struct