jsFP01StringPractice

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Study</title>
</head>
<body>
    <script>
        `use strict`
        //  a e i o u
        function vovelCount(str, vovels = ['a', 'e', 'i', 'o', 'u']) {
            let cnt = 0;
            str = str.toLowerCase();

            for (let letter of vovels) {
                for (let pos = -1; (pos = str.indexOf(letter, pos + 1)) != -1; ++cnt);
            }
            //[{ a: 4 }, { e: 6 }, { i: 0 }, { o: 7 }, { u: 1 }];
            return cnt;
        }

        function vovelCont(str) {
            str = str.toLowerCase();
            let arrStr = str.split('');
            let result = 0;
            for (let i = 0; i < arrStr.length; ++i) {
                if (arrStr[i] == 'a' || arrStr[i] == 'e' || arrStr[i] == 'i' || arrStr[i] == 'o' || arrStr[i] == 'u') {
                    ++result;
                }
            }
            return result;
        }

        function isSpam(str, spam = ['100% бесплатно', 'увеличение продаж', 'только сегодня', 'не удаляйте', 'ххх']) {
            str = str.toLowerCase();
            for (let word of spam) {
                if (str.includes(word)) { return true };
            }
            return false;
        }

        function truncate(str, len = str.length) {
            if (str.length > len) {
                return str.slice(0, len - 3) + '...';
            }
            return str;
        }

        {
            let test = "Hello, world!";
            let str = "A class or division of people or things regarded as having particular shared characteristics."
            let str1 = "A class or division of people or увеличение продаж things regarded as having particular shared characteristics."
            let str2 = "A class or division of people or things НЕ удАляйтЕ regarded as having particular shared characteristics."
            //console.log(vovelCount(test));
            //console.log(vovelCount(str));

            //console.log(vovelCont(test));
            //console.log(vovelCont(str));
            //console.log(isSpam(str));
            //console.log(isSpam(str1));
            //console.log(isSpam(str2));

            console.log(truncate(test));
            console.log(truncate(test, 8));
            "35*633"

        }
    </script>
</body>
</html>