题解 | #计算某字符出现次数#

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void async function () {
    // Write your code here
    let length = 0;
    let newLine = '';
    let c = '';
    while(line = await readline()){
       if(newLine) {
         c = line.toUpperCase();
         for(let i=0; i<newLine.length; i++) {
            if(c==newLine[i]) {
                length = length+1;
            }
         }
       } else {
        newLine =  line.toUpperCase();
       }
    }
    console.log(length);
}()