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I have an array of object that holds two objects. Each object has a couple properties; one being dealerNo. Given the value of dealerNo, how would I get the index of that object?

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Use .findIndex:

const getIndexByDealerNo = (arr=[], dealerNo) =>
  arr.findIndex(e => e.dealerNo===dealerNo);
  
const arr = [ { dealerNo:1 }, { dealerNo: 2 } ];

console.log( getIndexByDealerNo(arr, 1) );
console.log( getIndexByDealerNo(arr, 2) );
console.log( getIndexByDealerNo(arr, 11) );

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We tend not to answer poor questions that don't belong here in the first place as it just encourages more poor questions.

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