Init array of structs in Go

Question

I m newbie in Go  This issue is driving me nuts  How do you init array of structs in Go  type opt struct       shortnm      char     longnm  help string     needArg      bool    const basename opts   opt            opt               shortnm   a                longnm   quot multiple quot                needArg  false               help   quot Usage for a quot                      opt               shortnm   b                longnm   quot b-option quot                needArg  false               help   quot Usage for b quot          The compiler said it expecting   after   opt  Where should I put the braces   to init my array of struct

User · Answer

Adding this just as an addition to  jimt s excellent answer   one common way to define it all at initialization time is using an anonymous struct   var opts     struct       shortnm      byte     longnm  help string     needArg      bool          a    multiple    Usage for a   false                 shortnm   b           longnm    b-option           needArg  false          help      Usage for b              This is commonly used for testing as well to define few test cases and loop through them

User · Answer

It looks like you are trying to use  almost  straight up C code here  Go has a few differences    First off  you can t initialize arrays and slices as const  The term const has a different meaning in Go  as it does in C  The list should be defined as var instead  Secondly  as a style rule  Go prefers basenameOpts as opposed to basename opts  There is no char type in Go  You probably want byte  or rune if you intend to allow unicode codepoints   The declaration of the list must have the assignment operator in this case  E g   var x   foo  Go s parser requires that each element in a list declaration ends with a comma  This includes the last element  The reason for this is because Go automatically inserts semi-colons where needed  And this requires somewhat stricter syntax in order to work    For example   type opt struct       shortnm      byte     longnm  help string     needArg      bool    var basenameOpts     opt        opt           shortnm   a            longnm   multiple            needArg  false           help   Usage for a              opt           shortnm   b            longnm   b-option            needArg  false           help   Usage for b              An alternative is to declare the list with its type and then use an init function to fill it up  This is mostly useful if you intend to use values returned by functions in the data structure  init functions are run when the program is being initialized and are guaranteed to finish before main is executed  You can have multiple init functions in a package  or even in the same source file       type opt struct           shortnm      byte         longnm  help string         needArg      bool            var basenameOpts   opt      func init              basenameOpts     opt              opt                   shortnm   a                    longnm   multiple                    needArg  false                   help   Usage for a                              opt                   shortnm   b                    longnm   b-option                    needArg  false                  help   Usage for b                                    Since you are new to Go  I strongly recommend reading through the language specification  It is pretty short and very clearly written  It will clear a lot of these little idiosyncrasies up for you

User · Answer

You can have it this way  It is important to mind the commas after each struct item or set of items  earnings      LineItemsType           LineItemsType               TypeName   quot Earnings quot                Totals  0 0               HasTotal  true               items    LineItems                   LineItems                       name   quot Basic Pay quot                        amount  100 0                                      LineItems                       name   quot Commuter Allowance quot                        amount  100 0                                                       LineItemsType               TypeName   quot Earnings quot                Totals  0 0               HasTotal  true               items    LineItems                   LineItems                       name   quot Basic Pay quot                        amount  100 0                                      LineItems                       name   quot Commuter Allowance quot                        amount  100 0

[arrays] Init array of structs in Go

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