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Javascript – How to find named indexes in array of objects?

Sorry if I mistyped the question, but I am not sure how to explain this question. I am showing the value that I want by code below. I have an array with named indexes:

const comments = [
 {K6TTWcffVUQNryy19FrSVKYL6Wt2: {age:25,name:"john"}}, 
 {AXYVWcffVUQNryy19FrSVKYL6Wt3: {age:35,name:"sue"}}
]

I am trying to find the named indxes of the array of objects. I mean I am trying to create an array of ["K6TTWcffVUQNryy19FrSVKYL6Wt2", "AXYVWcffVUQNryy19FrSVKYL6Wt3"] using the above comments array.

How can I achieve this?

Tags:

3

Answers


  1. 0

    In order to get the properties of an object you can use for in loop, or Object.keys(yourObj)

    const comments = [{
    K6TTWcffVUQNryy19FrSVKYL6Wt2: {
      age: 25,
      name: "john"
    }
  },
  {
    AXYVWcffVUQNryy19FrSVKYL6Wt3: {
      age: 35,
      name: "sue"
    }
  }
]

var result = comments.map(function(item) {
  for (var prop in item) {
    // the first one
    return prop
  }
})

console.log(result)

// or
console.log(comments.map(item => Object.keys(item)[0]))
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  2. 0

    A combination of Array::reduce() and Object.keys():

    const comments = [
 {K6TTWcffVUQNryy19FrSVKYL6Wt2: {age:25,name:"john"}}, 
 {AXYVWcffVUQNryy19FrSVKYL6Wt3: {age:35,name:"sue"}}
];

const result = Object.keys(comments.reduce((r, el) => Object.assign(r, el), {}));

console.log(result);
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  3. 0

    You could map the keys.

    const
    comments = [{ K6TTWcffVUQNryy19FrSVKYL6Wt2: { age: 25, name: "john" } }, { AXYVWcffVUQNryy19FrSVKYL6Wt3: { age: 35, name: "sue" } }],
    keys = comments.flatMap(Object.keys);

console.log(keys);
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