Add Domain Name Extractor

Conversions/HexToBase64.js

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+//Hex Encoding to base64
+//Example: Hex=12c13f1d313c315cf313513d13; =====> Base64=EsE/HTE8MVzzE1E9Ew==;
+
+function hexToBase64 (hex) {
+ const hexToBase64 = hex => Buffer.from(hex, 'hex').toString('base64');
+ }
+ console.log('the result is ' + hexToBase64);
+}

Conversions/RomanToDecimalToRoman.js

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+// Convert from roman Number to decimal and Vice Versa
+
+var RomanNumerals = {
+ toRoman: function (number) {
+ var ret = ''
+ while (number > 0) {
+ if (number / 1000 >= 1) {
+ ret += 'M'
+ number -= 1000
+ } else if (number / 900 >= 1) {
+ ret += 'CM'
+ number -= 900
+ } else if (number / 500 >= 1) {
+ ret += 'D'
+ number -= 500
+ } else if (number / 400 >= 1) {
+ ret += 'CD'
+ number -= 400
+ } else if (number / 100 >= 1) {
+ ret += 'C'
+ number -= 100
+ } else if (number / 90 >= 1) {
+ ret += 'XC'
+ number -= 90
+ } else if (number / 50 >= 1) {
+ ret += 'L'
+ number -= 50
+ } else if (number / 40 >= 1) {
+ ret += 'XL'
+ number -= 40
+ } else if (number / 10 >= 1) {
+ ret += 'X'
+ number -= 10
+ } else if (number / 9 >= 1) {
+ ret += 'IX'
+ number -= 9
+ } else if (number / 5 >= 1) {
+ ret += 'V'
+ number -= 5
+ } else if (number / 4 >= 1) {
+ ret += 'IV'
+ number -= 4
+ } else if (number / 1 >= 1) {
+ ret += 'I'
+ number -= 1
+ }
+ }
+ return ret
+ },
+ fromRoman: function (str) {
+ var ret = 0
+ while (str.length > 0) {
+ switch (str.charAt(0)) {
+ case 'M':
+ str = str.slice(1)
+ ret += 1000
+ break
+ case 'D':
+ str = str.slice(1)
+ ret += 500
+ break
+ case 'L':
+ str = str.slice(1)
+ ret += 50
+ break
+ case 'C':
+ if (str.charAt(1) === 'M') {
+ str = str.slice(2)
+ ret += 900
+ } else if (str.charAt(1) === 'D') {
+ str = str.slice(2)
+ ret += 400
+ } else {
+ str = str.slice(1)
+ ret += 100
+ } break
+ case 'X':
+ if (str.charAt(1) === 'C') {
+ str = str.slice(2)
+ ret += 90
+ } else if (str.charAt(1) === 'L') {
+ str = str.slice(2)
+ ret += 40
+ } else {
+ str = str.slice(1)
+ ret += 10
+ } break
+ case 'V':
+ str = str.slice(1)
+ ret += 5
+ break
+ case 'I':
+ if (str.charAt(1) === 'X') {
+ str = str.slice(2)
+ ret += 9
+ } else if (str.charAt(1) === 'V') {
+ str = str.slice(2)
+ ret += 4
+ } else {
+ str = str.slice(1)
+ ret += 1
+ } break
+ }
+ }
+ return ret
+ }
+}

String/DomainNameExtractor.js

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+// domainName("http://github.com/TheAlgorithms") == "github"
+function domainName (url) {
+ var domain
+ if (url.indexOf('://') > -1) {
+ domain = url.split('/')[2]
+ } else {
+ domain = url.split('/')[0]
+ }
+
+ if (domain.indexOf('www.') > -1) {
+ domain = domain.split('www.')[1]
+ }
+
+ domain = domain.split(':')[0]
+ domain = domain.split('?')[0]
+ domain = domain.split('.')[0]
+
+ return domain
+}

String/WordsToSentence.js

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+// Example wordToSentence(['cat', 'dog', 'mouse']) // should return "cat, dog and mouse"
+function wordToSentence(words){
+ if(!words) return '';
+ words = words.filter((word) => word.length);
+ let formated = '';
+ for(let i=0; i<words.length; i++) {
+ if(i === words.length - 1 && i > 0) formated += ` and `;
+ else if (i > 0) formated += `, `;
+ formated += words[i];
+ }
+ return formated;
+}