Golang: JSON formatted byte slice

Question

I'm new to Go. Currently I have two arrays that look like:

words: ["apple", "banana", "peach"]
freq: [2, 3, 1]

where "freq" stores the count of each word in "words". I hope to combine the two arrays into a Json formatted byte slice that looks like

[{"w":"apple","c":2},{"w":"banana","c":3},{"w":"peach","c":1}]

How can I achieve this goal?

Currently I've declared a struct

type Entry struct {
  w string
  c int
}

and when I loop through the two arrays, I did

  res := make([]byte, len(words))
  for i:=0;i<len(words);i++ {
     obj := Entry{
       w: words[i], 
       c: freq[i],
     }
     b, err := json.Marshal(obj)
     if err==nil {
        res = append(res, b...)
     }
  }

  return res // {}{}{}

which doesn't gives me the desired result. Any help is appreciated. Thanks in advance.

Can you update with how you're using the for loo ? Also using a []Entry within the loop is better that appending to res. — John S Perayil
– John S Perayil, Commented Oct 17, 2016 at 5:00

John S Perayil · Accepted Answer · 2016-10-17 05:14:18Z

3

json.Marshal requires the struct fields to be exported.

You can use json tags to have json with small letter keys.

type Entry struct {
  W string `json:"w"`
  C int `json:"c"`
}

Also it would be easier to use a []Entry to generate the output json. Sample code.

edited Oct 17, 2016 at 5:14

answered Oct 17, 2016 at 5:07

John S Perayil

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1 Comment

fittaoee Over a year ago

Thank you very much sir!

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