Angular 7, create new object with some values from object

Question

I have object like this

const Obj =
"Value1": {
    "value1value": "1"
},
"Value2": {
    "value2value": "2"
},
"Value3": {
    "value3value": "3"
},
"BTest": {
    "1": "1",
    "2": "2"
},
"Value4": {
    "value4value": "value4value"
},
"ATest": {
    "1": "1",
    "2": "2"
},
"Value5": {
    "value5value": "value5value",
    "value6value": "value6value"
},
"TestA": {
    "1": "1",
    "2": "2"
};

What i need is to create new object that will look like this

cont newObject = 
    "Value1": {
        "value1value": "1"
    },
    "Value2": {
        "value2value": "2"
    },
    "Value3": {
        "value3value": "3"
    },
    "Value4": {
        "value4value": "value4value"
    },
    "Value5": {
        "value5value": "value5value",
        "value6value": "value6value"
    };

Some values are removed, i have tried with like

const newObject = Obj.map(o => {
          return {  };
        });

But i had no luck, does somebody knows what has to be done, thanks in advance

@MiomirDancevic delete the property that you don't want ['BTest', 'ATest','TestA'].forEach(e => delete obj[e]); — Joel Joseph
– Joel Joseph, Commented Aug 23, 2019 at 6:00
This is better solution :) I have asked here question, maybe you can write an answer stackoverflow.com/questions/57620649/… — Miomir Dancevic
– Miomir Dancevic, Commented Aug 23, 2019 at 6:06

jitender · Accepted Answer · 2019-08-23 05:45:08Z

1

Looks like you want to extract keys which starts with specific value so you can do something like

var obj={"Value1": {
    "value1value": "1"
},
"Value2": {
    "value2value": "2"
},
"Value3": {
    "value3value": "3"
},
"BTest": {
    "1": "1",
    "2": "2"
},
"Value4": {
    "value4value": "value4value"
},
"ATest": {
    "1": "1",
    "2": "2"
},
"Value5": {
    "value5value": "value5value",
    "value6value": "value6value"
},
"TestA": {
    "1": "1",
    "2": "2"
}}

let newObj={};

Object.keys(obj).forEach(k=>{
if(k.startsWith('Value')){
newObj[k]=obj[k];
}
})
console.log(newObj)

answered Aug 23, 2019 at 5:45

jitender

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Comments

Azzam Asghar · Accepted Answer · 2019-08-23 05:50:10Z

1

If you do not want to use startwith etc and want to use full names how about this, You create an array with the names that you want to remove and than simply check add keys that are not in that array to new object. Something like this

const removeableItems = ["TestA", "BTest", "ATest"]
let newObj = {}
for (var key in obj) {
   if (obj.hasOwnProperty(key) && !removeableItems.includes(key)) {
      newObj[key] = obj[key];
   }
}

Here is a blitz showing this.

answered Aug 23, 2019 at 5:50

Azzam Asghar

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3 Comments

jitender Over a year ago

Op want to filter object keys not an array

Azzam Asghar Over a year ago

It is filtering object keys and not array if you look at stack blitz link. I myself added the array for keys that needs to be removed.

Azzam Asghar Over a year ago

{Value1: {…}, Value2: {…}, Value3: {…}, Value4: {…}…}. If you look at the console.

Yosvel Quintero · Accepted Answer · 2019-08-23 07:18:14Z

1

You can use Object.assign() and Spread syntax combined with Object.keys(), Array.prototype.filter(), Array.prototype.map() and String.prototype.startsWith():

const Obj = {"Value1": {"value1value": "1"},"Value2": {"value2value": "2"},"Value3": {"value3value": "3"},"BTest": {"1": "1","2": "2"},"Value4": {"value4value": "value4value"},"ATest": {"1": "1","2": "2"},"Value5": {"value5value": "value5value","value6value": "value6value"},"TestA": {"1": "1","2": "2"}};
const result = Object.assign(
  {},
  ...Object.keys(Obj)
    .filter(k => k.startsWith('Value'))
    .map(k => ({ [k]: Obj[k] }))
);

console.log(result);

edited Aug 23, 2019 at 7:18

answered Aug 23, 2019 at 5:45

Yosvel Quintero

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2 Comments

jitender Over a year ago

running your code give results as an array like [ { "Value1": { "value1value": "1" } }..... but op want result as object

Yosvel Quintero Over a year ago

Ups @jitender, I have fixed code solution.. Thanks for your comment

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