CODEWITHSUNDEEP
javascript
Sara Ree
Sara Ree

Reputation: 3543

create an empty object based on pattern of another object

I have an object like this:

const Media = {

    references: { analyze: [432, 5], translate: ["string", false] },
    extensions: { analyze: ["something"], translate: ["something here"] },
    words: ["a word"],
    brackets: [],
    pronounce: [],

    instructions: {
        Expand_Explain: ['Before_First_Movie_Watch_Explain', 'Before_First_Movie_Watch_Explain2', 'Before_First_Movie_Watch_Explain3'],
        Hot_Tutorial: ['1', 'some element', 2],
        Next: [54, true, "string"],
    }
}

And I want to create another object with only instructions property with empty arrays inside:

So this is the desired result:

const NewEmptyMedia = {
    instructions: {
        Expand_Explain: [],
        Hot_Tutorial: [],
        Next: [],
    }
}

Note: the pattern is the same for instructions property always but the number of properties inside instructions is variable.

I created a loop to do this but I need to check multiple if statements and it's really ugly...

Upvotes: 0

Views: 151

Answers (2)

Chris Lear
Chris Lear

Reputation: 6742

You can use a class, like this

const Media = {

    references: { analyze: [432, 5], translate: ["string", false] },
    extensions: { analyze: ["something"], translate: ["something here"] },
    words: ["a word"],
    brackets: [],
    pronounce: [],

    instructions: {
        Expand_Explain: ['Before_First_Movie_Watch_Explain', 'Before_First_Movie_Watch_Explain2', 'Before_First_Movie_Watch_Explain3'],
        Hot_Tutorial: ['1', 'some element', 2],
        Next: [54, true, "string"],
    }
}


class EmptyMedia  {
  constructor(template) {
    this.instructions = {};
    for (const arr in template.instructions) {
      this.instructions[arr] = [];
    }  
  }
}

console.log(new EmptyMedia(Media));

Upvotes: 0

Berk Kurkcuoglu
Berk Kurkcuoglu

Reputation: 1523

You can use a reducer on Object.keys for Media.instructions.

Something like this should suffice:

Object.keys(Media.instructions).reduce((acc, key) => ({...acc, [key]: []}), {});

Upvotes: 2

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