Storing replaced value into another array from an object

Question

I have an object that I loop with a for in loop that loops through the object to find the key and value.

house: {
  john: {
       love_off: "mary"
  }
}

My for in loop returns:

 for ( var key in house.john) {
     house.john[key.replace("_off","") = house.john[key];
 }

It returns a copy of the original array long with:

house: {
      john: {
           love: "mary"
           love_off: "mary"
      }
    }

How do I just get "love": "mary" from the object and add it to array that needs to be returned?

You need to replace the love_off pair with the new love pair? — henrique romao
– henrique romao, Commented Apr 13, 2017 at 17:34
No array appears at javascript at Question. Is resulting object expected result? Are you trying to get the new property and value? — guest271314
– guest271314, Commented Apr 13, 2017 at 17:36
I am just trying to get the new property and value. I misspoke. I apologize — Demon
– Demon, Commented Apr 13, 2017 at 18:26

Mihai Alexandru-Ionut · Accepted Answer · 2017-04-13 17:42:05Z

1

You have to use delete statement in order to delete the old property.

The delete operator removes a property from an object.

var object={
  "house": {
     "john": {
       "love_off": "mary"
     }
  }
}
 for ( var key in object.house.john) {         
     object.house.john[key.replace("_off","")] = object.house.john[key];
     if(object.house.john.hasOwnProperty(key))
         delete object.house.john[key];
 }
console.log(object);

edited Apr 13, 2017 at 17:42

answered Apr 13, 2017 at 17:35

Mihai Alexandru-Ionut

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6 Comments

charlietfl Over a year ago

might need to check if the property exists first

charlietfl Over a year ago

suggestion...use hasOwnProperty() ... value of property could be falsy but still exist. And would check before modifications

Mihai Alexandru-Ionut Over a year ago

@charlietfl, yes, you're right. hasOwnProperty is better choice in this situation.

guest271314 Over a year ago

@charlietfl "suggestion...use hasOwnProperty()" Interesting. If recollect correctly, have received two different comments recently suggesting to use or not use in operator. Is the a Question that you are aware of that addresses difference between in operator and .hasOwnProperty()?

charlietfl Over a year ago

@guest271314 simply to check if key is enumerable

|

guest271314 · Accepted Answer · 2017-04-13 17:38:52Z

1

If interpret Question correctly, you can use JSON.stringify(), JSON.parse() with .replace()

data = JSON.parse(JSON.stringify(data).replace(/_off(?=":)/, ""));

answered Apr 13, 2017 at 17:38

guest271314

1

2 Comments

Yosvel Quintero Over a year ago

Good answer!! But check that could be multiple properties with "_off" and with the method String.prototype.replace() only the first occurrence will be replaced

guest271314 Over a year ago

@YosvelQuintero The RegExp can be adjusted. Did not consider objects other than at OP before posting Answer

Fanyo SILIADIN · Accepted Answer · 2017-04-13 17:38:24Z

0

try this

var myArray= [] 
for ( var key in object.house.john) {         
     object.house.john[key.replace("_off","")] = object.house.john[key];
     delete object.house.john[key];
     myArray.push(object.house.john);
 }

answered Apr 13, 2017 at 17:38

Fanyo SILIADIN

7925 silver badges11 bronze badges

Comments

Yosvel Quintero · Accepted Answer · 2017-04-14 06:10:22Z

0

You can loop over all Object keys with Object.keys() using Array.prototype.forEach().

Than make the replacement and the most important is to delete the old key property.

Code example:

var obj = {house: {john: {love_off: "mary"}}};

Object.keys(obj.house.john).forEach(function (k) {
  obj.house.john[k.replace('_off', '')] = obj.house.john[k];
  delete obj.house.john[k];
});

console.log(obj);

answered Apr 14, 2017 at 6:10

Yosvel Quintero

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