Find index of object in javascript using its property name

Question

I want to find Index of javascript array of objects using objects property name. My code is :-

const checkbox = [{'mumbai': true},{'bangalore': true},{'chennai': true},{'kolkata': true}];

How can i find index of chennai? Can i acheive using lodash?

Mohammad Usman · Accepted Answer · 2019-02-13 08:15:23Z

2

You can use .findIndex()

const checkbox = [
  {'mumbai': true},
  {'bangalore': true},
  {'chennai': true},
  {'kolkata': true}
];

const finder = (arr, key) => arr.findIndex(o => key in o);

console.log(finder(checkbox, 'chennai'));
console.log(finder(checkbox, 'kolkata'));
console.log(finder(checkbox, 'delhi'));

answered Feb 13, 2019 at 8:15

Mohammad Usman

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allesklarbeidir · Accepted Answer · 2019-02-13 08:24:11Z

0

checkbox.map((v,i) => Object.keys(v).indexOf("chennai") !== -1 ? i : -1).filter(v => v !== -1)[0]

Will give you the index of "chennai", replace it with any other key to get a different index.

What this does is:

Map the array to an array indicating only indices which contain objects with the wanted key
Filter only the indices which you want
Get the first one (you can use the rest as well if there are multiple entries matching your search)

This works in every browser since it only uses .map() , Object.keys() and .filter()

answered Feb 13, 2019 at 8:24

allesklarbeidir

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