swg01-palindrome/index.js

Palindrome detector

module.exports = Phrase;

// Adds revers to all strings
String.prototype.reverse = function() {
  return Array.from(this).reverse().join("");
}


function emailParts(email) {
  return email.toLowerCase().split("@")
}

// Defines a Phrase object
function Phrase(content) {
  this.content = content;

  // Processes a string for palindrome checking
  // Returns content processed for palindrome testing.
  this.processedContent = function processedContent() {
    return this.letters().toLowerCase();
  }

  this.palindrome = function palindrome() {
    if (this.letters()) {
      return this.processedContent() === this.processedContent().reverse();
    } else {
      return false;
    }
  }  

  this.louder = function louder() {
    return this.content.toUpperCase();
  }

  this.letters = function() {
    const lettersRE = /[a-z]/ig;
    return (this.content.match(lettersRE) || []).join("")
  }
}