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) { let obj = {}; let arr = [...str]; arr.map(n => { if (n != false && obj[n] != undefined) { obj[n]++; } else { obj[n] = 1; } }) return obj; }