题解 | #统计字符#

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
    while(line = await readline()){
        const reg1 = /[a-zA-Z]/
        // 空格的正则规则
        const reg2 = /\s/
        const reg3 = /[0-9]/
        // arr = [0,0,0,0]
        let arr = new Array(4).fill(0)
        for (let i = 0; i < line.length; i++) {
            let char = line[i]
            if (reg1.test(char)) {
                arr[0]++
            } else if (reg2.test(char)) {
                arr[1]++
            } else if (reg3.test(char)) {
                arr[2]++
            } else {
                arr[3]++
            }
        }
        arr.forEach(item => console.log(item))

    }
}()