Retrieving JSON object value from Javascript

Question

I am new to Javascript and JSON. I want to get the following JSON values via Javascript. I need to retrieve the "login" value and add up the "a", "d" and "c" respectively. I managed to get "login" value but I couldn't figure out how do i retrieve "a", "d" and "c" values.

 var data = JSON.parse(text);
 $.each(data, function(i, v) {
 var login = v.login; // Get "login"
 var commits = 0;
 var additions = 0;
 var deletions = 0;
 var contributions = 0;
 $.each(data, function(j, w) {
 commits += w.c; // Get "c"
 additions += w.a; // Get "a"
 deletions += w.d; // Get "d"
 });
 });

JSON:

[
 {
 "total": 2,
 "weeks": [
 {
 "w": 1214092800,
 "a": 0,
 "d": 0,
 "c": 0
 },
 {
 "w": 1474761600,
 "a": 0,
 "d": 0,
 "c": 0
 },
 {
 "w": 1476576000,
 "a": 0,
 "d": 0,
 "c": 0
 }
 ],
 "author": {
 "login": "ramiro"
 }
 }
]

Answer 1

Try this it will work :

JSON :

var data = [
 {
 "total": 2,
 "weeks": [
 {
 "w": 1214092800,
 "a": 0,
 "d": 0,
 "c": 0
 },
 {
 "w": 1474761600,
 "a": 0,
 "d": 0,
 "c": 0
 },
 {
 "w": 1476576000,
 "a": 0,
 "d": 0,
 "c": 0
 }
 ],
 "author": {
 "login": "ramiro"
 }
 }
];

1. Using for in loop

var weekData = data[0].weeks; 
for (var i in weekData) {
 console.log(data[0].weeks[i].a,data[0].weeks[i].d,data[0].weeks[i].c);
}

2. using Array map method

var weekData = data[0].weeks; 
var returnData = weekData.map(function(e) {
return {
 a: e.a,
 d: e.d,
 c: e.c
 }
})
console.log(returnData);

Working fiddle : https://jsfiddle.net/ry49dz61/1/

• Pankaj Kumar: Using array filter is not a solution...you try seeing what weekData has...The result of weekData and returnData is same
• Pankaj Kumar: Yup this is fine...I think this is the best approach as of now
• Rohìt Jíndal: @PankajKumar Thanks a lot for the compliment..you can upvote this answer if you think it will be benfitial for others.

Answer 2

You could use array method map and reduce. jQuery is not quite necessary.

var retrieved = data.map(function(v) {
 var ret = v.weeks.reduce(function(a, b) {
 return {
 a: a.a + b.a,
 d: a.d + b.d,
 c: a.c + b.c
 }
 })
 ret.login = v.author.login
 return ret
})