main.go

// Source: https://leetcode.com/problems/valid-word
// Title: Valid Word
// Difficulty: Easy
// Author: Mu Yang <http://muyang.pro>

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// A word is considered **valid** if:
//
// - It contains a **minimum** of 3 characters.
// - It contains only digits (0-9), and English letters (uppercase and lowercase).
// - It includes **at least** one **vowel**.
// - It includes **at least** one **consonant**.
//
// You are given a string `word`.
//
// Return `true` if `word` is valid, otherwise, return `false`.
//
// **Notes:**
//
// - `'a'`, `'e'`, `'i'`, `'o'`, `'u'`, and their uppercases are **vowels**.
// - A **consonant** is an English letter that is not a vowel.
//
// **Example 1:**
//
// ```
// Input: word = "234Adas"
// Output: true
// Explanation:
// This word satisfies the conditions.
// ```
//
// **Example 2:**
//
// ```
// Input: word = "b3"
// Output: false
// Explanation:
// The length of this word is fewer than 3, and does not have a vowel.
// ```
//
// **Example 3:**
//
// ```
// Input: word = "a3$e"
// Output: false
// Explanation:
// This word contains a `'$'` character and does not have a consonant.
// ```
//
// **Constraints:**
//
// - `1 <= word.length <= 20`
// - `word` consists of English uppercase and lowercase letters, digits, `'@'`, `'#'`, and `'$'`.
//
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package main

import (
	"unicode"
)

func isValid(word string) bool {
	if len(word) < 3 {
		return false
	}

	hasVowel := false
	hasConsonant := false
	for _, ch := range word {
		if unicode.IsLetter(ch) {
			ch = unicode.ToLower(ch)
			if ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u' {
				hasVowel = true
			} else {
				hasConsonant = true
			}
		} else if unicode.IsDigit(ch) {
		} else {
			return false
		}
	}

	return hasVowel && hasConsonant
}