js 统计空格次数

Question

vara=["a","","","","b","","","c",""];计算后的结果是{a:3,b:2,c:1}

Answer 1

((a,_)=>a.reduce((p,c)=>
[_=c||_,_&&[p[_]=p[_]||0,!c&&(p[_]++)],p][2],{}))
(["a","","","","b","","","c",""],undefined)
会忽略第一个非空字符前的所有空字符。