Check.js是什么？探索其功能与应用

// check.js
/**
 * This script provides various utility functions to check different conditions.
 */
// Function to check if a number is prime
function isPrime(num) {
    if (num <= 1) return false;
    if (num <= 3) return true;
    if (num % 2 === 0 || num % 3 === 0) return false;
    for (let i = 5; i * i <= num; i += 6) {
        if (num % i === 0 || num % (i + 2) === 0) return false;
    }
    return true;
}
// Function to check if a string is a palindrome
function isPalindrome(str) {
    const cleanedStr = str.replace(/[^a-zA-Z0-9]/g, '').toLowerCase();
    const reversedStr = cleanedStr.split('').reverse().join('');
    return cleanedStr === reversedStr;
}
// Function to check if an email address is valid
function isValidEmail(email) {
    const emailRegex = /\s@]+@[^\s@]+\.[^\s@]+$/;
    return emailRegex.test(email);
}
// Function to check if a URL is valid
function isValidURL(url) {
    const urlRegex = /^(https?|ftp):\/\/[^\s$.?#].[^\s]*$/;
    return urlRegex.test(url);
}
// Example usage of the functions
console.log(isPrime(7)); // true
console.log(isPrime(4)); // false
console.log(isPalindrome("racecar")); // true
console.log(isPalindrome("hello")); // false
console.log(isValidEmail("test@example.com")); // true
console.log(isValidEmail("invalid-email")); // false
console.log(isValidURL("https://www.example.com")); // true
console.log(isValidURL("invalid-url")); // false
/* FAQs */
/**
 * How do I check if a number is prime using this script?
 * 
 * You can use theisPrime function to check if a number is prime. Simply pass the number as an argument to the function and it will returntrue if the number is prime andfalse otherwise. For example:
 * 
 * console.log(isPrime(7)); // true
 * console.log(isPrime(4)); // false
 */
/**
 * What are the requirements for a valid email address according to this script?
 * 
 * According to theisValidEmail function in this script, a valid email address must:
 * Contain exactly one "@" symbol.
 * Have characters before and after the "@" symbol.
 * End with a period followed by at least one character.
 * 
 * The regular expression used in the function is:
 * const emailRegex = /\s@]+@[^\s@]+\.[^\s@]+$/;
 * This ensures that the email meets the basic structure requirements for a valid email address.

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