Javascript Array of Object Code

Question

I want to create an Array of Objects as given below

var selection_json_str=[
 {
 "idx":0,
 "fieldname":"%Key0",
 "fieldvalue": [
 "05-5003",
 "05-5005",
 "06-6007",
 "06-6009"]
 },
 {
 "idx":1,
 "fieldname":"%Key1",
 "fieldvalue": [
 "5003",
 "5005",
 "6007",
 "6009"]
 },
 {
 "idx":2,
 "fieldname":"%Key2",
 "fieldvalue":[
 "1",
 "1"]
 }
]
var noCols = _this.Data.HeaderRows[0].length;
var selection_json_str = {}
for (var c = 0; c < noCols; c++) {
 var t = [];
 var a = []
 for (var r = 0; r < _this.Data.Rows.length; r++) {
 a.push(_this.Data.Rows[r][c].text);
 }
 //ConsoleInfo(a);
 //ConsoleInfo(GetUnique(a)); Get Unique Key from the list
 selection_json_str[c] = {
 idx: c,
 fieldname: _this.Data.HeaderRows[0][c].text,
 fieldvalue:GetUnique(a)
 };
}

I have a code which I have to change to get the above output , can any one help me out here . I need to have array of objects within selection_json_str . Can any help me out ?

• Hacketo: var selection_json_str = [] might work

Answer 1

Try:

var selection_json_str = new Array();
for (var c = 0; c < noCols; c++) {
 var t = [];
 var a = []
 for (var r = 0; r < _this.Data.Rows.length; r++) {
 a.push(_this.Data.Rows[r][c].text);
 }
 //ConsoleInfo(a);
 //ConsoleInfo(GetUnique(a)); Get Unique Key from the list
 selection_json_str.push({
 idx: c,
 fieldname: _this.Data.HeaderRows[0][c].text,
 fieldvalue:GetUnique(a)
 });
}

Explanation

A bit extra explanation:

I've changed selection_json_str to new Array() that we will know what kind of data will be there. And when I add a new element I just call selection_json_str.push(element). It's not necessary to call push, but I prefer to do it when I'm adding something to array. It gives a better understanding of code. (IMHO)
After our loop is done we'll have array of objects in selection_json_str

• Hacketo: push is not necessary here, the bracket notation used in OP code is fine too. Also it would be better to explain what changes you've made, instead of copy pasting a sample of code.
• Lokki: Is it better now? I know that push is not necessary, but I prefer to use it when I'm adding new element to array because it was made for it and it returns the length of array, so I save one line of code :)