How to Convert a Slice of Anonymous Structs to a Slice of Defined Structs in Golang?

Type Conversion between Slices of Structs in Golang

This inquiry centers around type conversion between slices of structs. Specifically, we aim to convert a slice of anonymous structs to a slice of a defined struct.

Underlying Issue

The issue arises due to the difference between the two struct types:

• Societe struct with a single field named Name
• Anonymous struct with a single field named Name tagged with json:"a.name"

The presence of the tag creates a distinct struct type, preventing direct conversion.

Solution Options

Option 1: Iteration and Copying

• Iterate through both slices and manually copy each field from the anonymous struct to the Societe struct.
• This approach is safe and reliable but less efficient due to the iterative nature.

<code class="go">ls := make(ListSociete, len(res))
for i := 0; i < len(res); i++ {
    ls[i].Name = res[i].Name
}
return ls, nil</code>

Option 2: Unsafe Conversion

• Direct type conversion using unsafe pointers.
• This method bypasses type checking and may result in runtime errors if the underlying data structures change unexpectedly.
• Caution: Use this approach cautiously as it compromises type safety.

<code class="go">return *(*ListSociete)(unsafe.Pointer(&amp;res)), nil</code>

Best Practices

• Define appropriate structs to represent the data model.
• Use explicit type conversions where necessary to maintain type safety.
• Opt for the safe iteration and copying approach for reliable conversions.

The above is the detailed content of How to Convert a Slice of Anonymous Structs to a Slice of Defined Structs in Golang?. For more information, please follow other related articles on the PHP Chinese website!