Мой вариант через filter :)
const getYears = (startY, endY, sumNum) => […Array(endY - startY + 1)].map((_, i) => startY + i).filter(a=>(a+’’).split(’’).reduce((b,c)=>+b+c*1)==sumNum);
const getYears = (startY, endY, sumNum) => […Array(endY - startY + 1)].map((_, i) => startY + i).filter(a=>(a+’’).split(’’).reduce((b,c)=>+b+c*1)==sumNum);