javascript Finders Keepers

Posted 2021-05-03

function findElement(arr, func) {
  // loop through array
  for (let i = 0; i < arr.length; i++) {
    // truth test, return array element for pass, undefined for fail
    if ( func(arr[i]) ) { return arr[i]; }

  }
  // no element in array has passed truth test, return undefined
  return undefined;
}

findElement([1, 2, 3, 4], num => num % 2 === 0);