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Converting a type to an array - GO syntax

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-3

In the below syntax_1,

 array := [...]float647.0, 8.5, 9.1

and syntax_2,

type People interface 
 SayHello()
 ToString()


type Student struct 
 Person
 university string
 course string


type Developer struct 
 Person
 company string
 platform string



func main()

 alex := StudentPerson"alex", 21, "111-222-XXX", "MIT","BS CS"
 john := DeveloperPerson"John", 35, "111-222-XXX", "Accel North America", "Golang"
 jithesh := DeveloperPerson"Jithesh", 33, "111-222-XXX", "Accel North America", "Hadoop"
 //An array with People types 
 peopleArr := [...]Peoplealex, john,jithesh

---

1) What does this syntax float647.0, 8.5, 9.1 & Peoplealex, john,jithesh mean? this looks like a paradigm(a way of programming) more than a syntax

2) Can you provide reference to the meaning/purpose of [...] syntax? I see converting something to an [] type

go

share|improve this question

edited Mar 28 at 14:17

overexchange

asked Mar 28 at 14:16

overexchangeoverexchange

4,23377 gold badges3737 silver badges9696 bronze badges

• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  It's all here: golang.org/ref/spec. 1) A composite literal, it is syntax, not "paradigm". 2) Create an array whose length is the same as the number of elements provided to the literal.
  
  – mkopriva
  Mar 28 at 14:17
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @mkopriva golang.org/search?q=%5B...%5D
  
  – overexchange
  Mar 28 at 14:17
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  1, 2, 3 is a composite literal, and "The notation ... specifies an array length equal to the maximum element index plus one."
  
  – icza
  Mar 28 at 14:18
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @overexchange what are you implying with that link? That it's hard to find? Try the link in my first comment and try searching that page with CTRL/CMD+F, that's more efficient.
  
  – mkopriva
  Mar 28 at 14:20
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Unnamed arrays* can't implement interfaces. It's objects that implement interfaces, so you have an array of objects and those objects implement the interface. Edit: I use objects here, but it may be more correct to say structs.
  
  – Devon
  Mar 28 at 14:31
  
  

  
  
  
  

 | 
show 6 more comments

-3

In the below syntax_1,

 array := [...]float647.0, 8.5, 9.1

and syntax_2,

type People interface 
 SayHello()
 ToString()


type Student struct 
 Person
 university string
 course string


type Developer struct 
 Person
 company string
 platform string



func main()

 alex := StudentPerson"alex", 21, "111-222-XXX", "MIT","BS CS"
 john := DeveloperPerson"John", 35, "111-222-XXX", "Accel North America", "Golang"
 jithesh := DeveloperPerson"Jithesh", 33, "111-222-XXX", "Accel North America", "Hadoop"
 //An array with People types 
 peopleArr := [...]Peoplealex, john,jithesh

---

1) What does this syntax float647.0, 8.5, 9.1 & Peoplealex, john,jithesh mean? this looks like a paradigm(a way of programming) more than a syntax

2) Can you provide reference to the meaning/purpose of [...] syntax? I see converting something to an [] type

go

share|improve this question

edited Mar 28 at 14:17

overexchange

asked Mar 28 at 14:16

overexchangeoverexchange

4,23377 gold badges3737 silver badges9696 bronze badges

• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  It's all here: golang.org/ref/spec. 1) A composite literal, it is syntax, not "paradigm". 2) Create an array whose length is the same as the number of elements provided to the literal.
  
  – mkopriva
  Mar 28 at 14:17
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @mkopriva golang.org/search?q=%5B...%5D
  
  – overexchange
  Mar 28 at 14:17
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  1, 2, 3 is a composite literal, and "The notation ... specifies an array length equal to the maximum element index plus one."
  
  – icza
  Mar 28 at 14:18
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @overexchange what are you implying with that link? That it's hard to find? Try the link in my first comment and try searching that page with CTRL/CMD+F, that's more efficient.
  
  – mkopriva
  Mar 28 at 14:20
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Unnamed arrays* can't implement interfaces. It's objects that implement interfaces, so you have an array of objects and those objects implement the interface. Edit: I use objects here, but it may be more correct to say structs.
  
  – Devon
  Mar 28 at 14:31
  
  

  
  
  
  

 | 
show 6 more comments

In the below syntax_1,

 array := [...]float647.0, 8.5, 9.1

and syntax_2,

type People interface 
 SayHello()
 ToString()


type Student struct 
 Person
 university string
 course string


type Developer struct 
 Person
 company string
 platform string



func main()

 alex := StudentPerson"alex", 21, "111-222-XXX", "MIT","BS CS"
 john := DeveloperPerson"John", 35, "111-222-XXX", "Accel North America", "Golang"
 jithesh := DeveloperPerson"Jithesh", 33, "111-222-XXX", "Accel North America", "Hadoop"
 //An array with People types 
 peopleArr := [...]Peoplealex, john,jithesh

---

1) What does this syntax float647.0, 8.5, 9.1 & Peoplealex, john,jithesh mean? this looks like a paradigm(a way of programming) more than a syntax

2) Can you provide reference to the meaning/purpose of [...] syntax? I see converting something to an [] type

go

share|improve this question

edited Mar 28 at 14:17

overexchange

asked Mar 28 at 14:16

overexchangeoverexchange

4,23377 gold badges3737 silver badges9696 bronze badges

 array := [...]float647.0, 8.5, 9.1

type People interface 
 SayHello()
 ToString()


type Student struct 
 Person
 university string
 course string


type Developer struct 
 Person
 company string
 platform string



func main()

 alex := StudentPerson"alex", 21, "111-222-XXX", "MIT","BS CS"
 john := DeveloperPerson"John", 35, "111-222-XXX", "Accel North America", "Golang"
 jithesh := DeveloperPerson"Jithesh", 33, "111-222-XXX", "Accel North America", "Hadoop"
 //An array with People types 
 peopleArr := [...]Peoplealex, john,jithesh

share|improve this question

edited Mar 28 at 14:17

overexchange

asked Mar 28 at 14:16

overexchangeoverexchange

4,23377 gold badges3737 silver badges9696 bronze badges

share|improve this question

edited Mar 28 at 14:17

overexchange

asked Mar 28 at 14:16

overexchangeoverexchange

4,23377 gold badges3737 silver badges9696 bronze badges

asked Mar 28 at 14:16

overexchangeoverexchange

4,23377 gold badges3737 silver badges9696 bronze badges

asked Mar 28 at 14:16

overexchangeoverexchange

4,23377 gold badges3737 silver badges9696 bronze badges

1 Answer
1

active

oldest

votes

0

Squiggly brackets are used to define a composite literal. A value that contains more than one value inside it. In your first example an array of float values is created
[...]float647.0, 8.5, 9.1 is a literal for an array of floats with 3 elements. In your second example, a few literals for predefined struct types are created and another array. Person"alex", 21, "111-222-XXX" is a literal for a struct of type Person. And [...]Peoplealex, john,jithesh is an array of type People containing 3 elements.

share|improve this answer

answered Mar 28 at 14:44

Mad WombatMad Wombat

7,33155 gold badges4242 silver badges7575 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can I say , Peoplealex, john, jitesh is a composite literal for a struct of type People? where name alex is pointing to a literal(object) for a struct of type Student?
  
  – overexchange
  Mar 28 at 15:15
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  People type is an interface, so anything that implements this interface can be a member of this array. For this code to work both Developer and Student need to implement People interface either directly or through the embedded Person struct.
  
  – Mad Wombat
  Mar 28 at 15:20
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  But Peoplealex, john, jitesh on its own is not valid. It needs [...] to make it an array of People. Or simply [] to make it a slice of People.
  
  – Mad Wombat
  Mar 28 at 15:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  [...]People is an array. []People is a slice. These are two different types.
  
  – Mad Wombat
  Mar 28 at 15:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  [...]People would create an empty array of zero elements, but [...]Peoplealex, john, jitesh would create a populated array of three elements
  
  – Mad Wombat
  Mar 28 at 15:24
  

  
  
  
  

add a comment
 | 

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0

Squiggly brackets are used to define a composite literal. A value that contains more than one value inside it. In your first example an array of float values is created
[...]float647.0, 8.5, 9.1 is a literal for an array of floats with 3 elements. In your second example, a few literals for predefined struct types are created and another array. Person"alex", 21, "111-222-XXX" is a literal for a struct of type Person. And [...]Peoplealex, john,jithesh is an array of type People containing 3 elements.

share|improve this answer

answered Mar 28 at 14:44

Mad WombatMad Wombat

7,33155 gold badges4242 silver badges7575 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can I say , Peoplealex, john, jitesh is a composite literal for a struct of type People? where name alex is pointing to a literal(object) for a struct of type Student?
  
  – overexchange
  Mar 28 at 15:15
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  People type is an interface, so anything that implements this interface can be a member of this array. For this code to work both Developer and Student need to implement People interface either directly or through the embedded Person struct.
  
  – Mad Wombat
  Mar 28 at 15:20
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  But Peoplealex, john, jitesh on its own is not valid. It needs [...] to make it an array of People. Or simply [] to make it a slice of People.
  
  – Mad Wombat
  Mar 28 at 15:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  [...]People is an array. []People is a slice. These are two different types.
  
  – Mad Wombat
  Mar 28 at 15:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  [...]People would create an empty array of zero elements, but [...]Peoplealex, john, jitesh would create a populated array of three elements
  
  – Mad Wombat
  Mar 28 at 15:24
  

  
  
  
  

add a comment
 | 

0

Squiggly brackets are used to define a composite literal. A value that contains more than one value inside it. In your first example an array of float values is created
[...]float647.0, 8.5, 9.1 is a literal for an array of floats with 3 elements. In your second example, a few literals for predefined struct types are created and another array. Person"alex", 21, "111-222-XXX" is a literal for a struct of type Person. And [...]Peoplealex, john,jithesh is an array of type People containing 3 elements.

share|improve this answer

answered Mar 28 at 14:44

Mad WombatMad Wombat

7,33155 gold badges4242 silver badges7575 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can I say , Peoplealex, john, jitesh is a composite literal for a struct of type People? where name alex is pointing to a literal(object) for a struct of type Student?
  
  – overexchange
  Mar 28 at 15:15
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  People type is an interface, so anything that implements this interface can be a member of this array. For this code to work both Developer and Student need to implement People interface either directly or through the embedded Person struct.
  
  – Mad Wombat
  Mar 28 at 15:20
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  But Peoplealex, john, jitesh on its own is not valid. It needs [...] to make it an array of People. Or simply [] to make it a slice of People.
  
  – Mad Wombat
  Mar 28 at 15:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  [...]People is an array. []People is a slice. These are two different types.
  
  – Mad Wombat
  Mar 28 at 15:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  [...]People would create an empty array of zero elements, but [...]Peoplealex, john, jitesh would create a populated array of three elements
  
  – Mad Wombat
  Mar 28 at 15:24
  

  
  
  
  

add a comment
 | 

Squiggly brackets are used to define a composite literal. A value that contains more than one value inside it. In your first example an array of float values is created
[...]float647.0, 8.5, 9.1 is a literal for an array of floats with 3 elements. In your second example, a few literals for predefined struct types are created and another array. Person"alex", 21, "111-222-XXX" is a literal for a struct of type Person. And [...]Peoplealex, john,jithesh is an array of type People containing 3 elements.

share|improve this answer

answered Mar 28 at 14:44

Mad WombatMad Wombat

7,33155 gold badges4242 silver badges7575 bronze badges

share|improve this answer

answered Mar 28 at 14:44

Mad WombatMad Wombat

7,33155 gold badges4242 silver badges7575 bronze badges

answered Mar 28 at 14:44

Mad WombatMad Wombat

7,33155 gold badges4242 silver badges7575 bronze badges

answered Mar 28 at 14:44

Mad WombatMad Wombat

7,33155 gold badges4242 silver badges7575 bronze badges