Go

JSON: Nested Array

See more JSON Examples

Here we have a JSON object that contains nested arrays. This example demonstrates how to access the contents of the nested arrays.

{
 "numbers" : [ 
    ["even", 2, 4, 6, 8], 
    ["prime", 2, 3, 5, 7, 11, 13] 
  ] }

Go

    success := false

    json := chilkat.NewJsonObject()

    // This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
    // The presence of whitespace chars for pretty-printing makes no difference to the Load
    // method. 
    jsonStr := "{ \"numbers\" : [ [\"even\", 2, 4, 6, 8], [\"prime\", 2, 3, 5, 7, 11, 13] ] }"

    success = json.Load(jsonStr)
    if success != true {
        fmt.Println(json.LastErrorText())
        json.DisposeJsonObject()
        return
    }

    // Get the value of the "numbers" object, which is an array that contains JSON arrays.
    outerArray := json.ArrayOf("numbers")
    if json.LastMethodSuccess() == false {
        fmt.Println("numbers array not found.")
        json.DisposeJsonObject()
        return
    }

    numArrays := outerArray.Size()
    var i int

    for i = 0; i <= numArrays - 1; i++ {

        innerArray := outerArray.ArrayAt(i)

        // The first item in the innerArray is a string
        fmt.Println(*innerArray.StringAt(0), ":")

        numInnerItems := innerArray.Size()
        var j int
        for j = 1; j <= numInnerItems - 1; j++ {

            fmt.Println("  ", innerArray.IntAt(j))

        }

        innerArray.DisposeJsonArray()
    }

    outerArray.DisposeJsonArray()

    json.DisposeJsonObject()