Merge two sets of js object by their positions using Underscorejs

Question

Object 1:

{a50: "PTP-1",b51: "09+75",c52: "112D",d53: "60.745",e54: "72.698",f55: "72.695",g56: "0.003",h57: null,i58: null, j59: "68.918", k60: null}

object 2:

[{ipid:'50', type:'Constant'},{ipid:'51', type:'Constant'},{ipid:'52', type:'Constant'},{ipid:'53', type:'Constant'},{ipid:'54', type:'Constant'},{ipid:'55', type:'Constant'},{ipid:'56', type:'Constant'},{ipid:'57', type:'Variable'},{ipid:'58', type:'Variable'},{ipid:'59', type:'Variable'},{ipid:'60', type:'Variable'}]

(Screenshot)

I have this two javascript object which have the same length and i would like to combine and produce a new javascript object

[
    {ipid: "50", type: "Constant", a50: "PTP-1"},
    {ipid: "51", type: "Constant", b51: "09+75"},
    {ipid: "52", type: "Constant", c52: "112D"},
    {ipid: "53", type: "Constant", d53: "60.745"},
    {ipid: "54", type: "Constant", e54: "72.698"},
    {ipid: "55", type: "Constant", f55: "72.695"},
    {ipid: "56", type: "Constant", g56: "0.003"},
    {ipid: "57", type: "Variable", h57: null},
    {ipid: "58", type: "Variable", i58: null},
    {ipid: "59", type: "Constant", j59: "68.918"},
    {ipid: "60", type: "Variable", k60: null}
]

am looking for faster and efficient code. (Perhaps just in native js)

Thank you

Can you provide code of the second object, instead of a screenshot? Also, what's with the single-character prefix in object 1? If it didn't have that, this would be so much simpler and more efficient. — Cerbrus
– Cerbrus, Commented May 20, 2014 at 9:35
Can you show us what you tried so far? And a demo to reproduce your particular issue where you got stuck? — elclanrs
– elclanrs, Commented May 20, 2014 at 9:40
As far as I can see from the screenshot your object 2 is a Array.. I have tried what I think you want to do: jsfiddle.net/2SM3W — TryingToImprove
– TryingToImprove, Commented May 20, 2014 at 9:45

Cerbrus · Accepted Answer · 2014-05-20 11:20:14Z

1

Have a look at this:

var obj1 = {a50: "PTP-1",b51: "09+75",c52: "112D",d53: "60.745",e54: "72.698",f55: "72.695",g56: "0.003",h57: null,i58: null, j59: "68.918", k60: null}
var obj2 = [{ipid:'50', type:'Constant'},{ipid:'51', type:'Constant'},{ipid:'52', type:'Constant'},{ipid:'53', type:'Constant'},{ipid:'54', type:'Constant'},{ipid:'55', type:'Constant'},{ipid:'56', type:'Constant'},{ipid:'57', type:'Variable'},{ipid:'58', type:'Variable'},{ipid:'59', type:'Variable'},{ipid:'60', type:'Variable'}]

var output = [],
    key = '';

for(key in obj1){
    if(obj1.hasOwnProperty(key)){
        var current = obj2.filter(function(e){
            return e.ipid == key.substr(1)
        });
        for(var i = 0; i < current.length; i++){
            var temp = {
                ipid: current[i].ipid,
                type: current[i].type
            }
            temp[key] = obj1[key];
            output.push(temp);
        }
    }
}

This returns the following result:

[
    {"ipid": "50", "type": "Constant", "a50": "PTP-1"},
    {"ipid": "51", "type": "Constant", "b51": "09+75"},
    {"ipid": "52", "type": "Constant", "c52": "112D"},
    {"ipid": "53", "type": "Constant", "d53": "60.745"},
    {"ipid": "54", "type": "Constant", "e54": "72.698"},
    {"ipid": "55", "type": "Constant", "f55": "72.695"},
    {"ipid": "56", "type": "Constant", "g56": "0.003"},
    {"ipid": "57", "type": "Variable", "h57": null},
    {"ipid": "58", "type": "Variable", "i58": null},
    {"ipid": "59", "type": "Variable", "j59": "68.918"},
    {"ipid": "60", "type": "Variable", "k60": null}
]

edited May 20, 2014 at 11:20

answered May 20, 2014 at 9:52

Cerbrus

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2 Comments

Muhaimin Over a year ago

i use use strict version. Any thank you so much for your help for saving the day

Cerbrus Over a year ago

@MuhaiminAbdul: In that case, the key is a string ;-) Thanks for accepting my answer.

Taner Topal · Accepted Answer · 2014-05-20 11:49:39Z

1

var a = {a50: "PTP-1",b51: "09+75",c52: "112D",d53: "60.745",e54: "72.698",f55: "72.695",g56: "0.003",h57: null,i58: null, j59: "68.918", k60: null};
var b = [{ipid:'50', type:'Constant'},{ipid:'51', type:'Constant'},{ipid:'52', type:'Constant'},{ipid:'53', type:'Constant'},{ipid:'54', type:'Constant'},{ipid:'55', type:'Constant'},{ipid:'56', type:'Constant'},{ipid:'57', type:'Variable'},{ipid:'58', type:'Variable'},{ipid:'59', type:'Variable'},{ipid:'60', type:'Variable'}];

var aTransformed = {};

for(var key in a) {
    var obj = {};
    obj[key] = a[key];
    aTransformed[key.slice(1)] = { key: a[key] };
}

b = _.map(b, function (obj) {
    return _.extend(obj, aTransformed[obj.ipid]);
});

answered May 20, 2014 at 11:49

Taner Topal

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1 Comment

Muhaimin Over a year ago

thanks @Taner. _.map n _.extend indeed an alternative. But I prefer above answer because it's vanillajs

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