题解 | #计算某字符出现次数#
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 str = await readline();
let char = await readline();
let count = 0 ;
if(char !== ""){
let strArr = str.split('');
let lowercaseStrArr = strArr.map(item => item.toLowerCase());
let lowercaseChar = char.toLowerCase();
let index = lowercaseStrArr.indexOf(lowercaseChar);
while(index !== -1){
count ++;
index = lowercaseStrArr.indexOf(lowercaseChar, index+1);
}
}
console.log(count);
}()
