Converting Javascript Multidimensional Array format

Question

I have an array that looks like this -

var myOldArray = [{
        "id": 1,
        "form_id": 4,
        "form_field_name": "field_1",
        "helperTitle": "This is Box 1's TItle",
        "helperText": "This is Box 1 data",
        "created_at": null,
        "updated_at": null
    },
    {
        "id": 2,
        "form_id": 4,
        "form_field_name": "field_2",
        "helperTitle": "Box 2 Title",
        "helperText": "Box 2 TExt",
        "created_at": null,
        "updated_at": null
    }
]

and I need to duplicate / copy / convert / ...whatever... that array to something like this -

myNewArray = {
  field_1['title'] = "This is Box 1's Title",
  field_1['text'] = "This is Box 1 data",
  field_2['title'] = "Box 2 Title",
  field_2['text'] = "Box 2 Text",
}

so that I can reference it by

  console.log(myNewArray.field_1.title) 

or something more usable.

I have attempted to use the filter method to no avail. Everything I've attempted just returns undefined. I'm just super confused. Is there a better way to reference the elements in the sub array directly without converting?

This was sorta working... the console.log would output what I wanted but the returned value would output as undefined, which is confusing me.

 myOldArray = [{ "id": 1, "form_id": 4, "form_field_name": "field_1", "helperTitle": "This is Box 1's TItle", "helperText": "This is Box 1 data", "created_at": null, "updated_at": null }, { "id": 2, "form_id": 4, "form_field_name": "field_2", "helperTitle": "Box 2 Title", "helperText": "Box 2 TExt", "created_at": null, "updated_at": null } ] var AR = myOldArray; var newArr = AR.filter(function(item) { if (item.form_field_name == fieldName) { console.log('txt - ' + item + '\\n\\n'); return item; } }); 

Answer 1

You could map the items in new objects with the wanted properties as objects.

It works with

• mapping the objects of the array with Array#map ,
• taking the relevant properties with a destructuring assignment and make some renaming with object property assignment pattern [YDKJS: ES6 & Beyond] ,
• return a new object with a computed property name field with another object with the renamed properties,
• assigns all new objects to a single object with Object.assign and spread syntax ...

 var data = [{ id: 1, form_id: 4, form_field_name: "field_1", helperTitle: "This is Box 1's TItle", helperText: "This is Box 1 data", created_at: null, updated_at: null }, { id: 2, form_id: 4, form_field_name: "field_2", helperTitle: "Box 2 Title", helperText: "Box 2 TExt", created_at: null, updated_at: null }], result = Object.assign( ...data.map(({ id, helperTitle: title, helperText: text }) => ({ ['field_' + id]: { title, text } })) ); console.log(result); 

 .as-console-wrapper { max-height: 100% !important; top: 0; } 

Answer 2

I am guessing all of the processing should be in the $.get function :

$.getJSON('/api/system/formHelperText/4', function (data) { 
    var myNewArray = data.map(function(item) {
        var obj = {};
        obj['field_' + item.id] = { Title: item.helperTitle, Text: item.helperText };
        return obj;
    });
    console.log(myNewArray);
};

Answer 3

You can write a simple reduce call to get the desired output:

 const array=[{id:1,form_id:4,form_field_name:"field_1",helperTitle:"This is Box 1's TItle",helperText:"This is Box 1 data",created_at:null,updated_at:null},{id:2,form_id:4,form_field_name:"field_2",helperTitle:"Box 2 Title",helperText:"Box 2 TExt",created_at:null,updated_at:null}] const result= array.reduce((acc, a) => (acc[a.form_field_name] = {title: a.helperTitle,text: a.helperText}, acc), {}); console.log(result); 

Answer 4

The answer is very simple:

const objs = new Map();

for (const obj of myOldArray) {
    objs.set(obj.form_field_name, obj);
}

And now you can access your objects by the field name:

const myObj = objs.get("field_1");