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index.js
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index.js
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module.exports = Phrase;
//Add `reverse` to all strings
String.prototype.reverse = function() {
return Array.from(this)
.reverse()
.join("");
};
String.prototype.blank = function() {
return !!this.match(/^\s*$/gm);
};
Array.prototype.last = function() {
return this.pop();
};
//Defines a Phrase object.
function Phrase(content) {
this.content = content;
//Returns content processed for palindrome testing
this.processedContent = function processedContent() {
return this.letters().toLowerCase();
};
//Returns the letters in the content.
this.letters = function letters() {
const lettersRegex = /[a-z]/gi;
return (this.content.match(lettersRegex) || []).join("");
};
//Returns true for a palindrom, false otherwise.
this.palindrome = function palindrome() {
if (this.letters()) {
return this.processedContent() === this.processedContent().reverse();
} else {
return false;
}
}
}