Message Validation - FreeCodeCamp Daily Challenge

Introduction

Problem Statement

Given a message string and a validation string, determine if the message is valid. A message is valid if each word in the message starts with the corresponding letter in the validation string, in order. The comparison is case-insensitive. Words in the message are separated by single spaces.

Initial Analysis

Understanding the Problem

• The message is split into words using spaces as separators.
• Each word must start with the corresponding letter in the validation string.
• The comparison is case-insensitive.
• The number of words in the message must match the length of the validation string.
• If any word does not meet the condition, the message is invalid.
• If all words meet the condition, the message is valid.
• Return true if the message is valid, false otherwise.

Identified Test Cases

Solution Development

Chosen Approach

• Split the message into words using spaces as separators.
• Compare the first letter of each word with the corresponding letter in the validation string.
• Ensure that the number of words matches the length of the validation string.
• Implement the comparison in a case-insensitive manner.
• Return true if all words meet the condition, false otherwise.

Implementation in JavaScript

/**
 * FreeCodeCamp Problem: Message Validator
 * Category: FreeCodeCamp
 *
 * @param {string} message - The message to validate
 * @param {string} validator - The validator string
 * @returns {boolean} Whether the message is valid according to the validator
 */
function isValidMessage(message, validator) {
  const words = message
    .replace(/[^a-z\s]/gi, '')
    .trim()
    .split(/\s+/)
    .filter(word => word.length > 0)

  if (words.length !== validator.length) {
    return false
  }

  for (let i = 0; i < words.length; i++) {
    if (words[i][0].toLowerCase() !== validator[i].toLowerCase()) {
      return false
    }
  }

  return true
}