#!/usr/bin/env node

function reverse_int(int){
    let ret = 0;

    for (let i = 0; int !== 0 ; ++i) {
        ret+=int%10;
        // parseInt is a casting
        int=parseInt(int/10);
        ret*=10;
    }

    return ret;
}

function is_palindrome(string){
    // sed syntax
    string=string.replace(/\s/g, "");

    let len = string.length - 1;
    for (let i = 0; i < len ; ++i) {
        if(string[i] !== string[len-i]) return false;
    }
    return true;
}

function alpha_sort(string){

    string=string.replace(/\s/g, "");

    let arr = Array.from(string);
    arr = arr.sort();
    return arr.join("");
}

function uppercase_words(string){
    // No argument defaults to space, argument is given for clarity
    let arr = string.split(" ");
    for (let i=0; i<arr.length; ++i) {
        arr[i] = arr[i].charAt(0).toUpperCase() + arr[i].substring(1);
    }
    return arr.join(" ");
}

function longest_word(string){
    let arr = string.split(" ");
    let max=0;
    for(let i=1; i<arr.length; ++i){
        if(arr[i].length>arr[max].length) max=i;
    }
    return arr[max];
}

function vowel_count(string){
    let ret = 0;
    for(let i=0; i<string.length; ++i){
        switch (string.charAt(i)) {
            case 'a':
            case 'e':
            case 'i':
            case 'o':
            case 'u':
                ++ret;
        }
    }
    return ret;
}

function is_prime(int){
    for(let i=parseInt(Math.sqrt(int)); i>1; --i){
        if(int%i === 0) return false;
    }
    return true;
}

// 1
let int_example = 123456789;
console.log("Reversing " + int_example + ": " + reverse_int(int_example));

// 2
let palindrome_example = "nurses run";
console.log("Checking \"" + palindrome_example + "\": " + is_palindrome(palindrome_example));

// 3
let alpha_example="zyxwvutsrqponmlkjihgfedcba";
console.log("Alphabetically sorting \"" + alpha_example + "\": " + alpha_sort(alpha_example));

// 4
let upper_example = "the quick brown fox";
console.log("Parsing \"" + upper_example + "\": " + uppercase_words(upper_example));

// 5
let longest_example = "Web Development Tutorial";
console.log("Parsing \"" + longest_example + "\": " + longest_word(longest_example));

// 6
let vowel_example = "the quick brown fox";
console.log("Counting vowels in \"" + vowel_example + "\": " + vowel_count(vowel_example));

// 7
let prime_example = 274876858367;
console.log(is_prime(prime_example));