So this is my question (maybe stupid), is there any possible to do this:
var data {
"label" : value,
"sets" : [
for (var i=0; i < item.length; i++)
{
somedata: "data"
}
]
}
to reach result:
var data {
"label" : value,
"sets" : [
{
somedata: "data1"
},
{
somedata: "data2"
}
]
}
Much thx for help.
As jimm101 has pointed out, you are not working with JSON, that's just JavaScript (the var in there proves it) . If you want to calculate a value inside a literal JavaScript object, you can use an immediately invoked function
var data = {
"label" : value,
"sets" : (function(){
var arr = [];
for (var i=0; i < item.length; i++) {
arr.push( {somedata: "data" + i} ) ;
}
return arr;
})()
};
As dystroy has pointed out You can also use Array.map to return a transformed array, without needing an immediately invoked function, which looks a little nicer
You may use functional programming :
var data = {
"label" : "value",
"sets" : item.map(function(_,i){ return {somedata: "data"+(i+1)} })
}
Use the following:
var data = {
label: value,
get sets(){
var array = [];
/* write your logic to fill the array here. */
return array;
}
}
Reference here
As others have commented, JSON is data, not code. It looks like you're making javascript code though, since JSON also wouldn't include the var data part.
You can do something like this.
var data = {
"label" : 'my_label',
};
item = ['one','two','another'];
data.sets = [];
for (var i=0; i < item.length; i++)
{
data.sets.push({'somedata': item[i]});
}
var in there, so it's not JSON but I think the OP wants something inline? Also, "javascsript object => A structure within the javascript programming language that may use JavaScript Object Notation." JavaScript objects do not fully conform to JSON, no need to quote properties, and you can use single quotes.
You can use array comprehension (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Array_comprehensions), but it's not supported yet by all browsers (ECMAScript 6).
var value = "test";
var item = ["data1", "data2", "data3"];
var data = {
"label" : value,
"sets" : [for (x of item) {somedata: x}]
};
/*
Result :
data = {
"label":"test",
"sets":[
{"somedata":"data1"},
{"somedata":"data2"},
{"somedata":"data3"}
]
}
*/
You can have nested data in JSON like for example
var myObject = {
"first": "John",
"last": "Doe",
"age": 39,
"sex": "M",
"salary": 70000,
"registered": true,
"interests": [ "Reading", "Mountain Biking", "Hacking" ],
"favorites": {
"color": "Blue",
"sport": "Soccer",
"food": "Spaghetti"
},
"skills": [
{
"category": "JavaScript",
"tests": [
{ "name": "One", "score": 90 },
{ "name": "Two", "score": 96 }
]
},
{
"category": "CouchDB",
"tests": [
{ "name": "One", "score": 79 },
{ "name": "Two", "score": 84 }
]
},
{
"category": "Node.js",
"tests": [
{ "name": "One", "score": 97 },
{ "name": "Two", "score": 93 }
]
}
]
};
You can access such an array and its contents using a loop in your program
Source: http://www.json.com/
