function mysteryFunction(a) {
  let result = 0; // Initialize result to 0
  for (let i = 0; i < a.length; i++) { // Loop through each element in array 'a'
    result += (a[i] % 2 === 0) ? a[i] : 0;
  }
  return result; 
}
console.log(mysteryFunction([1, 2, 3, 4, 5]));
 

 
    
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