Find the index value of an array based on an array item object property value [duplicate]

Question

I have this array here (stressValues):

[ { angeredoutsidecontrol: 1 }, { difficultiespileup: 2 } ]

I'd like to find the array index value based on the property name of one of the contained objects, such as angeredoutsidecontrol, which would return 0

How can I achieve this?

This is what I have so far:

for(const value of values) {
  const stressValue = Object.values(value)[0];
  const valueName = Object.keys(value)[0];

  for (const name in stressValues) {
    if (name === valueName) {
      console.log(name);
      console.log(values.indexOf(name)); // trying to get it to return 0
    }
  }
}

Have you tried anything yet? Also, what if the array contains multiple object with the same property name. Do you return all indices or just one? — Khauri
– Khauri, Commented Jul 17, 2017 at 21:14

Naftali · Accepted Answer · 2017-07-18 13:35:42Z

2

const arr = [ { angeredoutsidecontrol: 1 }, { difficultiespileup: 2 } ];


function checkForKey(arr, key) {
    // loop through array
    for(let i = 0; i < arr.length; ++i) {
        const value = arr[i];
        // if value has the key, return the index
        if (value.hasOwnProperty(key)) {
            return i;
        }
    }
}


console.log('angeredoutsidecontrol', checkForKey(arr, 'angeredoutsidecontrol'));
console.log('difficultiespileup', checkForKey(arr, 'difficultiespileup'));

edited Jul 18, 2017 at 13:35

answered Jul 17, 2017 at 21:22

Naftali

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1 Comment

Anthony Over a year ago

Perfect, I was quite damn close too. Thanks a lot, I'll accept this as the answer when I'm able to.

Alberto Trindade Tavares · Accepted Answer · 2017-07-17 21:27:56Z

2

If the objects have always only one property, you can use Object.keys with findIndex:

var stressValues = [ { angeredoutsidecontrol: 1 }, { difficultiespileup: 2 } ];

var angerIndex = stressValues.findIndex((value) => Object.keys(value)[0] === 'angeredoutsidecontrol');
console.log(angerIndex);

EDIT: If you want a more generic solution, you can use includes, so we check if the object includes, in its keys, the specified one:

var stressValues = [ { angeredoutsidecontrol: 1, sadness: 3 }, { difficultiespileup: 2 } ];

var angerIndex = stressValues.findIndex((value) => Object.keys(value).includes('angeredoutsidecontrol'));
console.log(angerIndex);

edited Jul 17, 2017 at 21:27

answered Jul 17, 2017 at 21:22

Alberto Trindade Tavares

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4 Comments

Naftali Over a year ago

This assumes only one key/value pair per object.

Alberto Trindade Tavares Over a year ago

Yes, it works only in this case

Anthony Over a year ago

I can use Neal's solution programatically to achieve what I'm going for but thanks for your answer.

Alberto Trindade Tavares Over a year ago

@AnthonyMayfield I edited my answer with a more generic solution. Might be useful for you

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