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index.js
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index.js
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module.exports = Phrase;
// Adds `reverse` to all strings.
String.prototype.reverse = function reverse() {
return Array.from(this).reverse().join("");
}
// Defines a Phrase object.
function Phrase(content) {
this.content = content;
this.processor = function() {
return this.letters().toLowerCase();
}
//returns prococessed content for palindrome testing.
this.processedContent = function processedContent() {
return this.processor(this.content);
}
//Returns the letters in the content
this.letters = function letters() {
return (this.content.match(/[a-z]/gi) || []).join("");
}
// Returns true if the phrase is a palindrome, false otherwise.
this.palindrome = function palindrome() {
if (this.processedContent()) {
return this.processedContent() === this.processedContent().reverse();
} else {
return false
}
}
}