Hacker Rank pairSum challenge

hr-pairSum-v3.js

function pairSum(data, target) {
  const pairMatches = {};

  for(let i = 0; i < data.length; i++) {
    const number = data[i];
    const difference = (target - number);
    
    if (pairMatches[number]) { 
      return true; 
    }
    
    pairMatches[difference] = difference;
  }

  return false;
}