Checking if a value exists in an array of structs within a struct

Question

Supposing I have two structs. StructA, and StructB which contains an array of StructA's. How am I able to loop through a StructB and check the value of a variable in the StructA's within it?

type StructA struct {
    varA string
    varB string
    varC string
}    


type StructB struct {
    foo  []StructA
}

You might want to look at this: stackoverflow.com/questions/18926303/… to see another pattern. — WiredPrairie
– WiredPrairie, Commented Apr 28, 2017 at 10:49

I159 · Accepted Answer · 2017-04-28 08:45:59Z

1

Struct is not iterable in Go. Also you want to iterate thorough a foo attribute not through a multiple StructB fields. Therefore you should iterate through a slice which is an attribute of the struct. And then just check for equation to find a desired value or determine that it is not there.

Playground:

target := "C"
a := StructB{[]StructA{StructA{"A", "B", "C"}}}
for _, i := range a.foo {
    if target == i.varA {
        fmt.Println(i.varA)
    } else if target == i.varB {
        fmt.Println(i.varB)
    } else if target == i.varC {
        fmt.Println(i.varC)
    } else {
        fmt.Println("None of above")
    }
}

Go is pretty explicit and tricks seldom give a real profit.

edited Apr 28, 2017 at 8:45

answered Apr 27, 2017 at 14:04

I159

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2 Comments

William Poussier Over a year ago

"Struct is not iterable in Go." Reflection let one to iterate over a struct fields.

I159 Over a year ago

@WilliamPoussier, yes it is true, but does it help when @j0ykls1cCMbTWfD1 has a single field foo and wants to iterate through it?

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