Create object from another object in JavaScript

Question

I have an object like :

cols : [Object { name="firstname", type="string"}, Object { name="lastname", type="string"}, Object { name="valid", type="checkbox"} ....]

I need to create, from this object, and object like :

[
 {
 data: 'firstname'
 },
 {
 data: 'lastname'
 },
 {
 data: 'valid',
 type: checkbox
 }
]

The only rule is, if in the first object there is type="string", you just have to ignore it (check my second object). And of course it's just an example, so I need some automatic thing.

I'm trying to work in this function :

var headers = data.cols.map(function (el, index) { 
 return el.name;
});

Here I can retrieve my element el.name and el.type. But I don't know how can I create this specific object ? I tried with splice, push... but for create multiple lines etc.. I have no idea.

• Clément Andraud: Sorry, i'm working with symfony, but in this question it's not usefull you are right
• adeneo: That's not a valid object ?
• Felix Kling: JSON is a data-format, like XML or CSV.

Answer 1

You can use map function itself, but you need to create a new object and add all the fields based on the condition, like this

var data = [{
 name: 'firstname',
 type: 'string'
}, {
 name: 'lastname',
 type: 'string'
}, {
 name: 'valid',
 type: 'checkbox'
}];
var result = data.map(function (currentObject) {
 var object = {
 // Create an object with `name` property
 data: currentObject.name
 };
 if (currentObject.type !== 'string') {
 // create `type` property in the `object`, only if type is not `string`
 object.type = currentObject.type;
 }
 return object;
});
console.log(result);
[ { data: 'firstname' },
 { data: 'lastname' },
 { data: 'valid', type: 'checkbox' } ]

• Markai: It should be data: currentObject.name, shouldn't it?
• adeneo: Note that the initial array is invalid, and the objects within has no data properties, but in theory I suppose this could work, or something ?
• thefourtheye: @adeneo He can apply this idea, but I had to construct the object on my own. I included that also now :-)

Answer 2

use map function and return based on condition

var result = data.cols.map(function (d, i) {
 if (d.type == "string") 
 return { data: d.name } 
 else 
 return { data: d.name, type: d.type }
});