题解 | #字符串字符统计#
字符串字符统计
https://www.nowcoder.com/practice/777d0cd160de485cae0b1fd1dd973b44
function count(str) {
const arr = [...str].filter(item => item.trim() !== '')
const hash = {}
arr.map(key=>{
hash[key] = hash[key] ? hash[key]+=1 : 1
})
return hash
}
