CODEWITHSUNDEEP
javascriptarraysobject
BabyCoder
BabyCoder

Reputation: 39

Extracting certain properties from an object

I have an object that contains many properties. I need to extract only some of those properties for an array. The commonalities between the properties I need to extract are that myObject.property.type will return 'integer' - but I also need to extract one more property that would return 'string'. Then, I will transform this object into an array using the Object.keys() function.

I'm looking for some efficient and stylish ways to do this.

What I have:

      myObject: {
        badProperty1:  {type: 'object'},
        goodProperty1: {type: 'integer'},
        badProperty2:  {type: 'object'},
        goodProperty2: {type: 'string'},
        badProperty3:  {type: 'object'},
        goodProperty3: {type: 'integer'},
      }

What I want:

myArray = ['goodProperty1', 'goodProperty2', 'goodProperty3']

Upvotes: 0

Views: 950

Answers (1)

falinsky
falinsky

Reputation: 7428

You can at first get all the keys, then filter them by a type property value of the corresponding object for that key in the parent object. For example:

let myObject = {
  badProperty1:  {type: 'object'},
  goodProperty1: {type: 'integer'},
  badProperty2:  {type: 'object'},
  goodProperty2: {type: 'string'},
  badProperty3:  {type: 'object'},
  goodProperty3: {type: 'integer'},
};

let result = Object.keys(myObject).filter(key => ['integer', 'string'].includes(myObject[key].type));

console.log(result)

Upvotes: 2

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