goplayground

I am parsing large JSON file and I need parse its sub-object items.
You can see that items is in type []interface{}:

I succeed to parse the first object map[]string]interface{} but after that I am trying to parse pods["items"] which is in type []interface{} and I covnert it to []byte for the json.Unmarshal function and it failed with:

interface {} is []interface [], not []uint8

This is the code to reproduce:

I am doing some exercises in Go, and I have a strange behavior with my code. If someone could explain me the reason it could be really great.

Here is the code : https://play.golang.org/p/4fQYHWpD6Cj

I am trying to create a bunch of struct instance and append to a list after setting some values. This was reusing the variable. This was not working as it turns out golang was returning the same object. This is against what I expect. Is there any rationale for the behavior? What is the solution. Below is the code snippet from goplayground.

After reviewing several questions, I have decided to ask my question. A few things I can say...

• The struct I am inserting json data into is exported, and so are its fields.
• The struct I am inserting json data into was auto-generated by protoc.
• The struct and code I am using works in goplayground https://goplay.space/#WZWs3dsVcR5

The code I have is broken into a few parts.

protofile message defining the QueryParm struct.

I am writing a program in Golang that interfaces with a modified version of the barefoot mapmatching library which returns results in json via netcat.

My in my actual code json.Unmarshal will only parse the response to the nil value of the struct. But if print the json to console (see code snippet below) and copy paste into goplayground it behaves as expected.

I am wondering if this is an encoding issue that is bypassed when I copy paste from the console as a result.

How do I get my code to process the same string as it is received from barefoot as when it is copy pasted from the console?

Here is the relevant code snippet (structs are identical to goplayground)

I have two numbers for example the numbers are 12 and 16.

factors of 12 are 1, 2, 3, 4, 6, 12

factors of 16 are 1, 2, 4, 8, 16

common factors of these two numbers are 1, 2 and 4.

So the number of common factors are 3. I need to build a Go program for finding the number common factors of two numbers. But the program should be efficient and with minimum number of loops or without loops. I will provide my code and you can also contribute and suggest with another best methods.

I am trying to parse a time string which is transported on the wire as JSON. In the below code, I am just experimenting the time parsing as part of that:

I am looking into golang as my new goto language for my web-backend. My current language there is PHP, where I implemented a datastructure resembling the Backbone Collection/Model structure.

This means I have a Collection containing multiple Models. Models have an attributes dictionary for storing the actual "public data". Collections have multiple convenience methods operating on the array of Models (sort, getByIndex, getByMatchingParameter, etc). Models also have their share of convenience methods.

In daily life there will be 90% of "things" that are represented the same way. For example I can store an Address the same way I store my User. Having an AddressesCollection containing my Addresses I can simply ask my AddressesCollection to give me all AddressModels where city=Berlin. And implementing this matching in my base class I can do the logically same thing on my UserCollection giving me all my Users which are deactivated by deactivated=true.

But sometimes (10%) I need a special method. getGeoData for Addresses for example. Now, in my oop-world, I can simply create a new class extending my BaseModel adding my method and use my extended class everywhere where my base class was used.

How does this work in Go. I read a lot introductions into embedding / composition. But simply do not get my head around this.

This is where I stand, keep in mind this is my playground for learning the "inheritance" concept, not for having a production ready Collection / Model implementation.

GoPlayground

What I get is that I haven't "understood" how to write a "generic" method accepting not-quite-inherited types. I have the feeling that I have to use an interface there somewhere to get this "inheritance"/"extended class" feeling. But my current use of this is... well...

But maybe I am completely wrong in my concept of implementing my desired structure that way in go at all? Maybe there is a much more elegant way. Any hints greatly appreciated!

Here I am trying to create a query string for my API from a slice containing strings.

ie. where={"node_name":"node1","node_name":"node_2"}