Jim Yuan  Hang

Jim Yuan Hang

1594563241

Handling Null JSON Arrays in Golang (Go)

One of the most frustrating things with Go is how it handles empty arrays when encoding JSON. Rather than returning what is traditionally expected, an empty array, it instead returns null. For example, the following:

package main

import (
	"encoding/json"
	"fmt"
)

// Bag holds items
type Bag struct {
	Items []string
}

// PrintJSON converts payload to JSON and prints it
func PrintJSON(payload interface{}) {
	response, _ := json.Marshal(payload)
	fmt.Printf("%s\n", response)
}


func main() {
	bag1 := Bag{}
	PrintJSON(bag1)
}

Outputs:

{"Items":null}

This occurs because of how the json package handles nil slices:

Array and slice values encode as JSON arrays, except that []byte encodes as a base64-encoded string, and a nil slice encodes as the null JSON value.

There are some proposals to amend the json package to handle nil slices:

But, as of this writing, these proposals have not been accepted. As such, in order to overcome the problem of null arrays, we have to set nil slices to empty slices.

#tips-and-tricks #go #json #golang

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Handling Null JSON Arrays in Golang (Go)
Brandon  Adams

Brandon Adams

1625637060

What is JSON? | JSON Objects and JSON Arrays | Working with JSONs Tutorial

In this video, we work with JSONs, which are a common data format for most web services (i.e. APIs). Thank you for watching and happy coding!

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https://youtu.be/T74OdSCBJfw

JSON Google Extension
https://chrome.google.com/webstore/detail/json-formatter/bcjindcccaagfpapjjmafapmmgkkhgoa?hl=en

Endpoint Example
http://maps.googleapis.com/maps/api/geocode/json?address=13+East+60th+Street+New+York,+NY

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#jsons #json arrays #json objects #what is json #jsons tutorial #blondiebytes

Jim Yuan  Hang

Jim Yuan Hang

1594563241

Handling Null JSON Arrays in Golang (Go)

One of the most frustrating things with Go is how it handles empty arrays when encoding JSON. Rather than returning what is traditionally expected, an empty array, it instead returns null. For example, the following:

package main

import (
	"encoding/json"
	"fmt"
)

// Bag holds items
type Bag struct {
	Items []string
}

// PrintJSON converts payload to JSON and prints it
func PrintJSON(payload interface{}) {
	response, _ := json.Marshal(payload)
	fmt.Printf("%s\n", response)
}


func main() {
	bag1 := Bag{}
	PrintJSON(bag1)
}

Outputs:

{"Items":null}

This occurs because of how the json package handles nil slices:

Array and slice values encode as JSON arrays, except that []byte encodes as a base64-encoded string, and a nil slice encodes as the null JSON value.

There are some proposals to amend the json package to handle nil slices:

But, as of this writing, these proposals have not been accepted. As such, in order to overcome the problem of null arrays, we have to set nil slices to empty slices.

#tips-and-tricks #go #json #golang

Neal  Bode

Neal Bode

1599287850

Golang Array Example | Arrays in Go Tutorial Explained

Golang array is a fixed-size collection of items of the same type. The items of an array are stored sequentially and can be accessed using their index. If we want to declare an array in Go, a programmer specifies the type of the elements and the number of items required by an array.

Golang array example

Golang programming language provides a data structure called an** array**, which can store the fixed-size sequential collection of items of the same type.

The array is used to store the collection of data, but it is often more useful to think of the array as the collection of variables of the same type.

Instead of declaring individual variables, such as no1, no2, …, and no99, you declare one array variable such as numbers and use no[0], no[1], and …, no[99] to represent individual variables.

#golang #go #golang array #golang programming

Fannie  Zemlak

Fannie Zemlak

1599854400

What's new in the go 1.15

Go announced Go 1.15 version on 11 Aug 2020. Highlighted updates and features include Substantial improvements to the Go linker, Improved allocation for small objects at high core counts, X.509 CommonName deprecation, GOPROXY supports skipping proxies that return errors, New embedded tzdata package, Several Core Library improvements and more.

As Go promise for maintaining backward compatibility. After upgrading to the latest Go 1.15 version, almost all existing Golang applications or programs continue to compile and run as older Golang version.

#go #golang #go 1.15 #go features #go improvement #go package #go new features

Encoding JSON from GO | JSON in GO | Golang Tutorial

Encoding structured data:
JSON in GO Programming. Simple Go program using JSON.
Golang Tutorial video.

JSON (JavaScript Object Notation) is a simple data interchange format. Syntactically it resembles the objects and lists of JavaScript. It is most commonly used for communication between web back-ends and JavaScript programs running in the browser, but it is used in many other places, too
#json #jsongolang #golang #golangprogramming #goprogram

#json #jsongolang #golang #go