题解 | #计算某字符出现次数#

const readline = require("readline");

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
});
const lines = [];

rl.on("line", function (line) {
  if (line) {
    lines.push(line);
  }
})

rl.on("close", function () {
  calc(lines);
})

let cnt = 0;

const calc = (lines: string[]) => {
    const [targetString,matchChar] = lines
    for(let i = 0;i<targetString.length;i++){
        if(matchChar.toLowerCase() == targetString[i].toLowerCase()){
            cnt++
        }
    }
    console.log(cnt)
}