CODEWITHSUNDEEP
javascriptarraysnode.jsreactjs
ColdSharper
ColdSharper

Reputation: 84

Array key does not get interpolated when making object

I'm turning JSON into an array and back into separate JSON objects (it has to do with React and children). The array below works fine, as does putting array elements into vars. But when I try to make an obj from them, the key does not work, it just stays as "myKey" - Why? What is the right way to turn array elements into objects?

var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var methodOverride = require('method-override');
var fetch = require('isomorphic-fetch');
app.use(bodyParser.json());
app.use(methodOverride());


var promise = new Promise(function(resolve, reject) {
fetch('https://jsonplaceholder.typicode.com/posts/1').then(
function(response){
 return response.json();
    }
).then(function(jsonData){

    result = []

    for(var i in jsonData) {
        result.push([i, jsonData [i]]);
    }

    var myKey = result[0][0];
    var myValue = result[0][1];
    var myJSON = {myKey : myValue}

    console.log(myJSON);


   });

});

Upvotes: 1

Views: 97

Answers (3)

Muhammad Usman
Muhammad Usman

Reputation: 10148

There is a simple way you can get this working

var myJSON = {};
myJson.myKey = myValue;
myJson.myKey2 = myJsonValue2;
..

Upvotes: 0

Derek Brown
Derek Brown

Reputation: 4419

Because myKey is interpreted as a value, not as a variable. You need to use the dynamic key syntax, which is:

{ [myKey] : myValue }

Complete code:

var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var methodOverride = require('method-override');
var fetch = require('isomorphic-fetch');
app.use(bodyParser.json());
app.use(methodOverride());


var promise = new Promise(function(resolve, reject) {
fetch('https://jsonplaceholder.typicode.com/posts/1').then(
function(response){
 return response.json();
    }
).then(function(jsonData){

    result = []

    for(var i in jsonData) {
        result.push([i, jsonData [i]]);
    }

    var myKey = result[0][0];
    var myValue = result[0][1];
    var myJSON = {[myKey] : myValue}

    console.log(myJSON);


   });

});

Upvotes: 2

vs1682
vs1682

Reputation: 555

use the key with square brackets.

var myJSON = {[myKey] : myValue}

Upvotes: 1

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