如何使用 javascript 在数组中获取动态 JSON object 的索引

Question

I want to define a function to find index of a JSON object in an array. The JSON object is dynamic. Here object keys/attributes are not constant in JSON .

How to find index of matched object (all key& values) in array?

For example:

let obj={name:'Bill', phone:'8562456871', email:'bill@email.com'};
let arrayObj=[{street:'wardcircle', city:'Brentwood'},{name:'wan',email:'wan@test.com' },{name:'bill', phone:'8562456871', email:'bill@email.com'}];
let indx=getIndex(obj,arrayObj); // expected result is 2

I have defined function like this but it is not working for all dynamic attribute & values:

getIndex(obj,arrayObj){
 Object.keys(obj),forEach((key,index)=>{
 return arrayObject.findIndex(x=>x[key]==obj[key]);// Here I am unable to add AND condition for other key& values.
 });
}

Answer 1

Put the .findIndex first , and inside it, check that .every one of the Object.keys matches.

Note that your current object has name: 'Bill' but the array has name: 'bill' - the values should match, case sensitivity matters (unless you want to ignore it, in which case you'll have to call toLowerCase() on both values first).

 let obj = { name: 'bill', phone: '8562456871', email: 'bill@email.com' }; let arrayObj = [{ street: 'wardcircle', city: 'Brentwood' }, { name: 'wan', email: 'wan@test.com' }, { name: 'bill', phone: '8562456871', email: 'bill@email.com' }]; const getIndex = (findObj, array) => ( array.findIndex(obj => ( Object.entries(findObj).every(([key, val]) => obj[key] === val) )) ); console.log(getIndex(obj, arrayObj));

If you also want to make sure that the found object doesn't have any properties not in the findObj , check that the number of keys on both are the same too:

 let obj = { name: 'bill', phone: '8562456871', email: 'bill@email.com' }; let arrayObj = [{ street: 'wardcircle', city: 'Brentwood' }, { name: 'wan', email: 'wan@test.com' }, { name: 'bill', phone: '8562456871', email: 'bill@email.com' }]; const getIndex = (findObj, array) => ( array.findIndex(obj => ( Object.keys(obj).length === Object.keys(findObj).length && Object.entries(findObj).every(([key, val]) => obj[key] === val) )) ); console.log(getIndex(obj, arrayObj));