node v6.2.0 > var codePoints = [10548, 65039] undefined > var s1 = String.fromCharCode(...codePoints) undefined > var s2 = codePoints.map((p)=>{return String.fromCharCode(p)}).join() undefined > s1 '⤴️' > s2 '⤴,️' > s1 === s2 false > s1.le…