如何基于golang中的条件从json对象数组中获取值？

Question

I have an array like this.

[{
    "seq" : 2,
    "amnt" : 125
},
{
    "seq" : 3
    "amnt" : 25
},
{
    "seq" : 2
    "amnt" : 250
}]

I need to fetch objects from this array where seq is 2.

In Linq we have extensions in which I can put a where condition.

In Go do I need to loop through and get it using for loop or is there another way?

Please suggest me an optimum way.

Note: The json has many fields, for this example I gave only two.

I'm a new learner of Go.

Answer 1

I dont know about 'optimal' way to do this but here is what you can do for now to move forward:

package main

import (
    "encoding/json"
    "fmt"
)

func main() {
    byt := []byte(`[{"seq": 2,"amnt": 125},{"seq": 3,"amnt": 25},{"seq": 2,"amnt": 250}]`)

    var dat []map[string]int

    if err := json.Unmarshal(byt, &dat); err != nil {
        panic(err)
    }

    for idx := range dat {

        if dat[idx]["seq"] == 2 {
            fmt.Println("bingo")
        }
    }
}

Goodluck.

Edit: in my first answer I assumed that you might have non-numeric values so that's why I used interface{} type but after @JimB suggestion I changed that to seek only int type, so if you have to have some string or any other type in you json payload the unmarshaling will fail.