题解 | #计算某字符出现次数#filter
计算某字符出现次数
https://www.nowcoder.com/practice/a35ce98431874e3a820dbe4b2d0508b1
const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;
void async function () {
let line = (await readline()).toUpperCase().split("");
let c = (await readline()).toUpperCase();
console.log(line.filter(item=>item==c).length||0)
}()
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