returns a value from a set that meets conditions

heightTrigger.js

function getActiveHeightTrigger(triggersMap) {
  // returns the smalles height from a set of heights that is more than the window height
  return triggersMap.reduce((pV, cV) => {
    // is this height more than window?
    let checkWindow = (cV.height >= window.innerHeight);
    // is this height less than previous height?
    let checkPrev = (cV.height < pV.height);

    if (checkWindow) {
      if (checkPrev || !pV.height) return cV;
    }
    return pV;
  }, {});
}

let tTest = [
  {
    height: 615,
    className: 'height-615',
  },
  {
    height: 675,
    className: 'height-675',
  },
  {
    height: 715,
    className: 'height-715',
  },
  {
    height: 815,
    className: 'height-815',
  },
];