{"id":155,"date":"2023-08-11T10:04:27","date_gmt":"2023-08-11T10:04:27","guid":{"rendered":"https:\/\/kourentzes.com\/konstantinos\/?p=155"},"modified":"2023-08-17T10:51:35","modified_gmt":"2023-08-17T10:51:35","slug":"js-library-of-common-functions","status":"publish","type":"post","link":"https:\/\/kourentzes.com\/konstantinos\/index.php\/2023\/08\/11\/js-library-of-common-functions\/","title":{"rendered":"JS Library of common functions"},"content":{"rendered":"\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
function<\/span> <\/span>capitalizeFirstLetter<\/span>(<\/span>str<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>return<\/span> <\/span>str<\/span>.<\/span>charAt<\/span>(<\/span>0<\/span>)<\/span>.<\/span>toUpperCase<\/span>() <\/span>+<\/span> <\/span>str<\/span>.<\/span>slice<\/span>(<\/span>1<\/span>)<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/console.log(capitalizeFirstLetter('hello')); \/\/ Output: 'Hello'<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>getRandomNumber<\/span>(<\/span>min<\/span>,<\/span> <\/span>max<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>return<\/span> <\/span>Math<\/span>.<\/span>floor<\/span>(<\/span>Math<\/span>.<\/span>random<\/span>() <\/span>*<\/span> (<\/span>max<\/span> <\/span>-<\/span> <\/span>min<\/span> <\/span>+<\/span> <\/span>1<\/span>)) <\/span>+<\/span> <\/span>min<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/console.log(getRandomNumber(1, 10)); \/\/ Output: Random number between 1 and 10<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>validEmail<\/span>(<\/span>email<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>emailPattern<\/span> <\/span>=<\/span> <\/span>\/<\/span>^<\/span>[^<\/span>\\s@<\/span>]+<\/span>@<\/span>[^<\/span>\\s@<\/span>]+<\/span>\\.<\/span>[^<\/span>\\s@<\/span>]+<\/span>$<\/span>\/<\/span>;<\/span><\/span>\n  <\/span>return<\/span> <\/span>emailPattern<\/span>.<\/span>test<\/span>(<\/span>email<\/span>)<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/console.log(validEmail('test@example.com')); \/\/ Output: true<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>calculateAge<\/span>(<\/span>birthdate<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>birthYear<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>Date<\/span>(<\/span>birthdate<\/span>)<\/span>.<\/span>getFullYear<\/span>()<\/span>;<\/span><\/span>\n  <\/span>const<\/span> <\/span>currentYear<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>Date<\/span>()<\/span>.<\/span>getFullYear<\/span>()<\/span>;<\/span><\/span>\n  <\/span>return<\/span> <\/span>currentYear<\/span> <\/span>-<\/span> <\/span>birthYear<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/console.log(calculateAge('1990-05-15')); \/\/ Output: Current age based on birthdate<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>reverseArray<\/span>(<\/span>arr<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>return<\/span> <\/span>arr<\/span>.<\/span>slice<\/span>()<\/span>.<\/span>reverse<\/span>()<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/const originalArray = [1, 2, 3, 4, 5];<\/span><\/span>\n\/\/console.log(reverseArray(originalArray)); \/\/ Output: [5, 4, 3, 2, 1]<\/span><\/span>\n<\/span>\n<\/span>\nfunction<\/span> <\/span>groupBy<\/span>(<\/span>array<\/span>,<\/span> <\/span>key<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>return<\/span> <\/span>array<\/span>.<\/span>reduce<\/span>(<\/span>(<\/span>result<\/span>,<\/span> <\/span>item<\/span>)<\/span> <\/span>=><\/span> <\/span>{<\/span><\/span>\n    (<\/span>result<\/span>[<\/span>item<\/span>[<\/span>key<\/span>]] <\/span>=<\/span> <\/span>result<\/span>[<\/span>item<\/span>[<\/span>key<\/span>]] <\/span>||<\/span> [])<\/span>.<\/span>push<\/span>(<\/span>item<\/span>)<\/span>;<\/span><\/span>\n    <\/span>return<\/span> <\/span>result<\/span>;<\/span><\/span>\n  <\/span>},<\/span> <\/span>{}<\/span>)<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/*<\/span><\/span>\nconst data = [<\/span><\/span>\n  { category: 'A', value: 1 },<\/span><\/span>\n  { category: 'B', value: 2 },<\/span><\/span>\n  { category: 'A', value: 3 }<\/span><\/span>\n];<\/span><\/span>\n<\/span>\nconsole.log(groupBy(data, 'category'));<\/span><\/span>\n*\/<\/span><\/span>\n\/\/ Output: { A: [ { category: 'A', value: 1 }, { category: 'A', value: 3 } ],<\/span><\/span>\n\/\/           B: [ { category: 'B', value: 2 } ] }<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>getRandomElement<\/span>(<\/span>arr<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>randomIndex<\/span> <\/span>=<\/span> <\/span>Math<\/span>.<\/span>floor<\/span>(<\/span>Math<\/span>.<\/span>random<\/span>() <\/span>*<\/span> <\/span>arr<\/span>.<\/span>length<\/span>)<\/span>;<\/span><\/span>\n  <\/span>return<\/span> <\/span>arr<\/span>[<\/span>randomIndex<\/span>]<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/const fruits = ['apple', 'banana', 'cherry', 'orange'];<\/span><\/span>\n\/\/console.log(getRandomElement(fruits)); \/\/ Output: Random fruit<\/span><\/span>\n<\/span>\n<\/span>\nfunction<\/span> <\/span>formatTime<\/span>(<\/span>hours<\/span>,<\/span> <\/span>minutes<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>formattedHours<\/span> <\/span>=<\/span> <\/span>hours<\/span>.<\/span>toString<\/span>()<\/span>.<\/span>padStart<\/span>(<\/span>2<\/span>,<\/span> <\/span>'<\/span>0<\/span>'<\/span>)<\/span>;<\/span><\/span>\n  <\/span>const<\/span> <\/span>formattedMinutes<\/span> <\/span>=<\/span> <\/span>minutes<\/span>.<\/span>toString<\/span>()<\/span>.<\/span>padStart<\/span>(<\/span>2<\/span>,<\/span> <\/span>'<\/span>0<\/span>'<\/span>)<\/span>;<\/span><\/span>\n  <\/span>return<\/span> <\/span>`${<\/span>formattedHours<\/span>}<\/span>:<\/span>${<\/span>formattedMinutes<\/span>}`<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/console.log(formatTime(9, 30)); \/\/ Output: '09:30'<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>formatDate<\/span>(<\/span>date<\/span>,<\/span> <\/span>language<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>options<\/span> <\/span>=<\/span> <\/span>{<\/span> year<\/span>:<\/span> <\/span>'<\/span>numeric<\/span>'<\/span>,<\/span> month<\/span>:<\/span> <\/span>'<\/span>long<\/span>'<\/span>,<\/span> day<\/span>:<\/span> <\/span>'<\/span>numeric<\/span>'<\/span> <\/span>};<\/span><\/span>\n  <\/span>return<\/span> <\/span>date<\/span>.<\/span>toLocaleDateString<\/span>(<\/span>language<\/span>,<\/span> <\/span>options<\/span>)<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/*<\/span><\/span>\nconst today = new Date();<\/span><\/span>\nconsole.log(formatDate(today, 'en-US')); \/\/ Output: August 17, 2023<\/span><\/span>\nconsole.log(formatDate(today, 'fr-FR')); \/\/ Output: 17 ao\u00fbt 2023<\/span><\/span>\n*\/<\/span><\/span>\n<\/span>\n\/*<\/span><\/span>\nlanguage settings common in Europe:<\/span><\/span>\n1. **English**: `en-US` (United States), `en-GB` (United Kingdom), `en-AU` (Australia), `en-CA` (Canada), etc.<\/span><\/span>\n2. **French**: `fr-FR` (France), `fr-BE` (Belgium), `fr-CA` (Canada), etc.<\/span><\/span>\n3. **German**: `de-DE` (Germany), `de-AT` (Austria), `de-CH` (Switzerland), etc.<\/span><\/span>\n4. **Spanish**: `es-ES` (Spain), `es-MX` (Mexico), `es-AR` (Argentina), etc.<\/span><\/span>\n5. **Italian**: `it-IT` (Italy), `it-CH` (Switzerland), etc.<\/span><\/span>\n6. **Portuguese**: `pt-PT` (Portugal), `pt-BR` (Brazil), etc.<\/span><\/span>\n7. **Dutch**: `nl-NL` (Netherlands), `nl-BE` (Belgium), etc.<\/span><\/span>\n8. **Swedish**: `sv-SE` (Sweden)<\/span><\/span>\n9. **Danish**: `da-DK` (Denmark)<\/span><\/span>\n10. **Norwegian**: `no-NO` (Norway), `nb-NO` (Bokm\u00e5l), `nn-NO` (Nynorsk)<\/span><\/span>\n11. **Finnish**: `fi-FI` (Finland)<\/span><\/span>\n12. **Russian**: `ru-RU` (Russia)<\/span><\/span>\n13. **Greek**: `el-GR` (Greece), `el-CY` (Cyprus)<\/span><\/span>\n14. **Polish**: `pl-PL` (Poland)<\/span><\/span>\n15. **Czech**: `cs-CZ` (Czech Republic)<\/span><\/span>\n16. **Hungarian**: `hu-HU` (Hungary)<\/span><\/span>\n17. **Romanian**: `ro-RO` (Romania)<\/span><\/span>\n18. **Bulgarian**: `bg-BG` (Bulgaria)<\/span><\/span>\n19. **Croatian**: `hr-HR` (Croatia)<\/span><\/span>\n20. **Slovak**: `sk-SK` (Slovakia)<\/span><\/span>\n21. **Slovenian**: `sl-SI` (Slovenia)<\/span><\/span>\n22. **Estonian**: `et-EE` (Estonia)<\/span><\/span>\n23. **Latvian**: `lv-LV` (Latvia)<\/span><\/span>\n24. **Lithuanian**: `lt-LT` (Lithuania)<\/span><\/span>\n25. **Irish**: `ga-IE` (Ireland)<\/span><\/span>\n26. **Maltese**: `mt-MT` (Malta)<\/span><\/span>\n27. **Icelandic**: `is-IS` (Iceland)<\/span><\/span>\n28. **Luxembourgish**: `lb-LU` (Luxembourg)<\/span><\/span>\n*\/<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>getDaysDiff<\/span>(<\/span>date1<\/span>,<\/span> <\/span>date2<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>timeDiff<\/span> <\/span>=<\/span> <\/span>Math<\/span>.<\/span>abs<\/span>(<\/span>date2<\/span> <\/span>-<\/span> <\/span>date1<\/span>)<\/span>;<\/span><\/span>\n  <\/span>return<\/span> <\/span>Math<\/span>.<\/span>ceil<\/span>(<\/span>timeDiff<\/span> <\/span>\/<\/span> (<\/span>1000<\/span> <\/span>*<\/span> <\/span>3600<\/span> <\/span>*<\/span> <\/span>24<\/span>))<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/const startDate = new Date('2023-08-01');<\/span><\/span>\n\/\/const endDate = new Date('2023-08-17');<\/span><\/span>\n\/\/console.log(getDaysDiff(startDate, endDate)); \/\/ Output: 16<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>isValidURL<\/span>(<\/span>url<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>urlPattern<\/span> <\/span>=<\/span> <\/span>\/<\/span>^<\/span>(<\/span>http:<\/span>\\\/\\\/<\/span>www<\/span>\\.<\/span>|<\/span>https:<\/span>\\\/\\\/<\/span>www<\/span>\\.<\/span>|<\/span>http:<\/span>\\\/\\\/<\/span>|<\/span>https:<\/span>\\\/\\\/<\/span>)?[<\/span>a-z0-9<\/span>]+([<\/span>\\-<\/span>\\.<\/span>]{1}[<\/span>a-z0-9<\/span>]+)*<\/span>\\.<\/span>[<\/span>a-z<\/span>]{2,5}(<\/span>:<\/span>[<\/span>0-9<\/span>]{1,5})?(<\/span>\\\/<\/span>.<\/span>*)?<\/span>$<\/span>\/<\/span>i<\/span>;<\/span><\/span>\n  <\/span>return<\/span> <\/span>urlPattern<\/span>.<\/span>test<\/span>(<\/span>url<\/span>)<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/console.log(isValidURL('https:\/\/www.example.com')); \/\/ Output: true<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>isLeapYear<\/span>(<\/span>year<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>return<\/span> (<\/span>year<\/span> <\/span>%<\/span> <\/span>4<\/span> <\/span>===<\/span> <\/span>0<\/span> <\/span>&&<\/span> <\/span>year<\/span> <\/span>%<\/span> <\/span>100<\/span> <\/span>!==<\/span> <\/span>0<\/span>) <\/span>||<\/span> <\/span>year<\/span> <\/span>%<\/span> <\/span>400<\/span> <\/span>===<\/span> <\/span>0<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/console.log(isLeapYear(2024)); \/\/ Output: true<\/span><\/span>\n<\/span>\n<\/span>\nfunction<\/span> <\/span>calculateDistanceBetweenPoints<\/span>(<\/span>x1<\/span>,<\/span> <\/span>y1<\/span>,<\/span> <\/span>x2<\/span>,<\/span> <\/span>y2<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>return<\/span> <\/span>Math<\/span>.<\/span>sqrt<\/span>((<\/span>x2<\/span> <\/span>-<\/span> <\/span>x1<\/span>) <\/span>**<\/span> <\/span>2<\/span> <\/span>+<\/span> (<\/span>y2<\/span> <\/span>-<\/span> <\/span>y1<\/span>) <\/span>**<\/span> <\/span>2<\/span>)<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/Not to be used with azimuth values, earth is a globe.<\/span><\/span>\n\/\/console.log(calculateDistanceBetweenPoints(1, 2, 4, 6)); \/\/ Output: 5<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>calculateHaversineDistance<\/span>(<\/span>lat1<\/span>,<\/span> <\/span>lon1<\/span>,<\/span> <\/span>lat2<\/span>,<\/span> <\/span>lon2<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>R<\/span> <\/span>=<\/span> <\/span>6371<\/span>;<\/span> <\/span>\/\/ Earth's radius in kilometers<\/span><\/span>\n  <\/span>const<\/span> <\/span>dLat<\/span> <\/span>=<\/span> <\/span>degToRad<\/span>(<\/span>lat2<\/span> <\/span>-<\/span> <\/span>lat1<\/span>)<\/span>;<\/span><\/span>\n  <\/span>const<\/span> <\/span>dLon<\/span> <\/span>=<\/span> <\/span>degToRad<\/span>(<\/span>lon2<\/span> <\/span>-<\/span> <\/span>lon1<\/span>)<\/span>;<\/span><\/span>\n  <\/span>const<\/span> <\/span>a<\/span> <\/span>=<\/span><\/span>\n    <\/span>Math<\/span>.<\/span>sin<\/span>(<\/span>dLat<\/span> <\/span>\/<\/span> <\/span>2<\/span>) <\/span>*<\/span> <\/span>Math<\/span>.<\/span>sin<\/span>(<\/span>dLat<\/span> <\/span>\/<\/span> <\/span>2<\/span>) <\/span>+<\/span><\/span>\n    <\/span>Math<\/span>.<\/span>cos<\/span>(<\/span>degToRad<\/span>(<\/span>lat1<\/span>)) <\/span>*<\/span> <\/span>Math<\/span>.<\/span>cos<\/span>(<\/span>degToRad<\/span>(<\/span>lat2<\/span>)) <\/span>*<\/span><\/span>\n    <\/span>Math<\/span>.<\/span>sin<\/span>(<\/span>dLon<\/span> <\/span>\/<\/span> <\/span>2<\/span>) <\/span>*<\/span> <\/span>Math<\/span>.<\/span>sin<\/span>(<\/span>dLon<\/span> <\/span>\/<\/span> <\/span>2<\/span>)<\/span>;<\/span><\/span>\n  <\/span>const<\/span> <\/span>c<\/span> <\/span>=<\/span> <\/span>2<\/span> <\/span>*<\/span> <\/span>Math<\/span>.<\/span>atan2<\/span>(<\/span>Math<\/span>.<\/span>sqrt<\/span>(<\/span>a<\/span>)<\/span>,<\/span> <\/span>Math<\/span>.<\/span>sqrt<\/span>(<\/span>1<\/span> <\/span>-<\/span> <\/span>a<\/span>))<\/span>;<\/span><\/span>\n  <\/span>return<\/span> <\/span>R<\/span> <\/span>*<\/span> <\/span>c<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>degToRad<\/span>(<\/span>degrees<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>return<\/span> <\/span>degrees<\/span> <\/span>*<\/span> (<\/span>Math<\/span>.<\/span>PI<\/span> <\/span>\/<\/span> <\/span>180<\/span>)<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/console.log(calculateHaversineDistance(34.0522, -118.2437, 40.7128, -74.0060)); \/\/ Output: Distance in kilometers<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>ExcelRound<\/span>(<\/span>number<\/span>,<\/span> <\/span>decimalPlaces<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>factor<\/span> <\/span>=<\/span> <\/span>Math<\/span>.<\/span>pow<\/span>(<\/span>10<\/span>,<\/span> <\/span>decimalPlaces<\/span>)<\/span>;<\/span><\/span>\n  <\/span>const<\/span> <\/span>roundedValue<\/span> <\/span>=<\/span> <\/span>Math<\/span>.<\/span>round<\/span>(<\/span>number<\/span> <\/span>*<\/span> <\/span>factor<\/span>)<\/span>;<\/span><\/span>\n  <\/span>return<\/span> <\/span>roundedValue<\/span> <\/span>\/<\/span> <\/span>factor<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/console.log(ExcelRound(4.723, 2)); \/\/ Output: 4.72<\/span><\/span>\n\/\/console.log(ExcelRound(4.725, 2)); \/\/ Output: 4.72<\/span><\/span>\n\/\/console.log(ExcelRound(4.726, 2)); \/\/ Output: 4.73<\/span><\/span>\n<\/span>\n<\/span>\nfunction<\/span> <\/span>calculateGCD<\/span>(<\/span>a<\/span>,<\/span> <\/span>b<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>if<\/span> (<\/span>b<\/span> <\/span>===<\/span> <\/span>0<\/span>) <\/span>return<\/span> <\/span>a<\/span>;<\/span><\/span>\n  <\/span>return<\/span> <\/span>calculateGCD<\/span>(<\/span>b<\/span>,<\/span> <\/span>a<\/span> <\/span>%<\/span> <\/span>b<\/span>)<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/*This function calculates the greatest common divisor (GCD) of two numbers using the Euclidean algorithm.*\/<\/span><\/span>\n\/\/console.log(calculateGCD(48, 18)); \/\/ Output: 6<\/span><\/span>\n<\/span>\nfunction<\/span> <\/span>generateRandomPassword<\/span>(<\/span>length<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>charset<\/span> <\/span>=<\/span> <\/span>'<\/span>abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789<\/span>'<\/span>;<\/span><\/span>\n  <\/span>let<\/span> <\/span>password<\/span> <\/span>=<\/span> <\/span>''<\/span>;<\/span><\/span>\n  <\/span>for<\/span> (<\/span>let<\/span> <\/span>i<\/span> <\/span>=<\/span> <\/span>0<\/span>;<\/span> <\/span>i<\/span> <\/span><<\/span> <\/span>length<\/span>;<\/span> <\/span>i<\/span>++<\/span>) <\/span>{<\/span><\/span>\n    <\/span>const<\/span> <\/span>randomIndex<\/span> <\/span>=<\/span> <\/span>Math<\/span>.<\/span>floor<\/span>(<\/span>Math<\/span>.<\/span>random<\/span>() <\/span>*<\/span> <\/span>charset<\/span>.<\/span>length<\/span>)<\/span>;<\/span><\/span>\n    <\/span>password<\/span> <\/span>+=<\/span> <\/span>charset<\/span>[<\/span>randomIndex<\/span>]<\/span>;<\/span><\/span>\n  <\/span>}<\/span><\/span>\n  <\/span>return<\/span> <\/span>password<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/console.log(generateRandomPassword(10)); \/\/ Output: Random password with 10 characters<\/span><\/span>\n<\/span>\n<\/span>\nfunction<\/span> <\/span>convertToRoman<\/span>(<\/span>number<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>romanNumerals<\/span> <\/span>=<\/span> <\/span>{<\/span><\/span>\n    <\/span>1000<\/span>:<\/span> <\/span>'<\/span>M<\/span>'<\/span>,<\/span> <\/span>900<\/span>:<\/span> <\/span>'<\/span>CM<\/span>'<\/span>,<\/span> <\/span>500<\/span>:<\/span> <\/span>'<\/span>D<\/span>'<\/span>,<\/span> <\/span>400<\/span>:<\/span> <\/span>'<\/span>CD<\/span>'<\/span>,<\/span><\/span>\n    <\/span>100<\/span>:<\/span> <\/span>'<\/span>C<\/span>'<\/span>,<\/span> <\/span>90<\/span>:<\/span> <\/span>'<\/span>XC<\/span>'<\/span>,<\/span> <\/span>50<\/span>:<\/span> <\/span>'<\/span>L<\/span>'<\/span>,<\/span> <\/span>40<\/span>:<\/span> <\/span>'<\/span>XL<\/span>'<\/span>,<\/span><\/span>\n    <\/span>10<\/span>:<\/span> <\/span>'<\/span>X<\/span>'<\/span>,<\/span> <\/span>9<\/span>:<\/span> <\/span>'<\/span>IX<\/span>'<\/span>,<\/span> <\/span>5<\/span>:<\/span> <\/span>'<\/span>V<\/span>'<\/span>,<\/span> <\/span>4<\/span>:<\/span> <\/span>'<\/span>IV<\/span>'<\/span>,<\/span> <\/span>1<\/span>:<\/span> <\/span>'<\/span>I<\/span>'<\/span><\/span>\n  <\/span>};<\/span><\/span>\n  <\/span>let<\/span> <\/span>result<\/span> <\/span>=<\/span> <\/span>''<\/span>;<\/span><\/span>\n  <\/span>for<\/span> (<\/span>const<\/span> <\/span>value<\/span> <\/span>in<\/span> <\/span>romanNumerals<\/span>) <\/span>{<\/span><\/span>\n    <\/span>while<\/span> (<\/span>number<\/span> <\/span>>=<\/span> <\/span>value<\/span>) <\/span>{<\/span><\/span>\n      <\/span>result<\/span> <\/span>+=<\/span> <\/span>romanNumerals<\/span>[<\/span>value<\/span>]<\/span>;<\/span><\/span>\n      <\/span>number<\/span> <\/span>-=<\/span> <\/span>value<\/span>;<\/span><\/span>\n    <\/span>}<\/span><\/span>\n  <\/span>}<\/span><\/span>\n  <\/span>return<\/span> <\/span>result<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/console.log(convertToRoman(1984)); \/\/ Output: 'MCMLXXXIV'<\/span><\/span>\n<\/span>\n<\/span>\nfunction<\/span> <\/span>postDataToWebService<\/span>(<\/span>url<\/span>,<\/span> <\/span>data<\/span>,<\/span> <\/span>callback<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>const<\/span> <\/span>xhr<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>XMLHttpRequest<\/span>()<\/span>;<\/span><\/span>\n  <\/span>xhr<\/span>.<\/span>open<\/span>(<\/span>'<\/span>POST<\/span>'<\/span>,<\/span> <\/span>url<\/span>,<\/span> <\/span>true<\/span>)<\/span>;<\/span><\/span>\n  <\/span>xhr<\/span>.<\/span>setRequestHeader<\/span>(<\/span>'<\/span>Content-Type<\/span>'<\/span>,<\/span> <\/span>'<\/span>application\/json<\/span>'<\/span>)<\/span>;<\/span><\/span>\n<\/span>\n  <\/span>xhr<\/span>.<\/span>onreadystatechange<\/span> <\/span>=<\/span> <\/span>function<\/span>()<\/span> <\/span>{<\/span><\/span>\n    <\/span>if<\/span> (<\/span>xhr<\/span>.<\/span>readyState<\/span> <\/span>===<\/span> <\/span>4<\/span>) <\/span>{<\/span><\/span>\n      <\/span>if<\/span> (<\/span>xhr<\/span>.<\/span>status<\/span> <\/span>===<\/span> <\/span>200<\/span>) <\/span>{<\/span><\/span>\n        <\/span>const<\/span> <\/span>responseData<\/span> <\/span>=<\/span> <\/span>JSON<\/span>.<\/span>parse<\/span>(<\/span>xhr<\/span>.<\/span>responseText<\/span>)<\/span>;<\/span><\/span>\n        <\/span>callback<\/span>(<\/span>null,<\/span> <\/span>responseData<\/span>)<\/span>;<\/span><\/span>\n      <\/span>}<\/span> <\/span>else<\/span> <\/span>{<\/span><\/span>\n        <\/span>callback<\/span>(<\/span>`<\/span>HTTP error! Status: <\/span>${<\/span>xhr<\/span>.<\/span>status<\/span>}`<\/span>)<\/span>;<\/span><\/span>\n      <\/span>}<\/span><\/span>\n    <\/span>}<\/span><\/span>\n  <\/span>};<\/span><\/span>\n<\/span>\n  <\/span>xhr<\/span>.<\/span>send<\/span>(<\/span>JSON<\/span>.<\/span>stringify<\/span>(<\/span>data<\/span>))<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/*<\/span><\/span>\nconst dataToSend = {<\/span><\/span>\n  name: 'John Doe',<\/span><\/span>\n  email: 'john@example.com'<\/span><\/span>\n};<\/span><\/span>\n<\/span>\nconst apiUrl = 'https:\/\/api.example.com\/endpoint'; \/\/ Replace with your actual API URL<\/span><\/span>\n<\/span>\npostDataToWebService(apiUrl, dataToSend, (error, response) => {<\/span><\/span>\n  if (!error) {<\/span><\/span>\n    console.log('Response from server:', response);<\/span><\/span>\n  } else {<\/span><\/span>\n    console.error('Error:', error);<\/span><\/span>\n  }<\/span><\/span>\n});<\/span><\/span>\n*\/<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
Obviously drop comments and minify before use…<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
function<\/span> <\/span>removeCommentsFromText<\/span>(<\/span>text<\/span>)<\/span> <\/span>{<\/span><\/span>\n  <\/span>\/\/ Regular expression to match single-line comments<\/span><\/span>\n  <\/span>const<\/span> <\/span>singleLineRegex<\/span> <\/span>=<\/span> <\/span>\/<\/span>\\\/\\\/<\/span>.<\/span>*<\/span>$<\/span>\/<\/span>gm<\/span>;<\/span><\/span>\n<\/span>\n  <\/span>\/\/ Regular expression to match multi-line comments<\/span><\/span>\n  <\/span>const<\/span> <\/span>multiLineRegex<\/span> <\/span>=<\/span> <\/span>\/<\/span>\\\/\\*<\/span>[<\/span>\\s\\S<\/span>]*?<\/span>\\*\\\/<\/span>\/<\/span>g<\/span>;<\/span><\/span>\n<\/span>\n  <\/span>\/\/ Remove single-line comments<\/span><\/span>\n  <\/span>const<\/span> <\/span>textWithoutSingleLineComments<\/span> <\/span>=<\/span> <\/span>text<\/span>.<\/span>replace<\/span>(<\/span>singleLineRegex<\/span>,<\/span> <\/span>''<\/span>)<\/span>;<\/span><\/span>\n<\/span>\n  <\/span>\/\/ Remove multi-line comments<\/span><\/span>\n  <\/span>const<\/span> <\/span>textWithoutComments<\/span> <\/span>=<\/span> <\/span>textWithoutSingleLineComments<\/span>.<\/span>replace<\/span>(<\/span>multiLineRegex<\/span>,<\/span> <\/span>''<\/span>)<\/span>;<\/span><\/span>\n<\/span>\n  <\/span>return<\/span> <\/span>textWithoutComments<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\nconst<\/span> javascriptCode <\/span>=<\/span> <\/span>`<\/span><\/span>\n\/\/ This is a single-line comment<\/span><\/span>\nconst x = 5;<\/span><\/span>\n<\/span>\n\/*<\/span><\/span>\nThis is a multi-line comment<\/span><\/span>\nthat spans multiple lines.<\/span><\/span>\n*\/<\/span><\/span>\nfunction foo() {<\/span><\/span>\n  \/\/ This is another comment<\/span><\/span>\n  return 42;<\/span><\/span>\n}<\/span><\/span>\n`<\/span>;<\/span><\/span>\n<\/span>\nconst<\/span> codeWithoutComments <\/span>=<\/span> <\/span>removeCommentsFromText<\/span>(javascriptCode)<\/span>;<\/span><\/span>\nconsole<\/span>.<\/span>log<\/span>(codeWithoutComments)<\/span>;<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"
Obviously drop comments and minify before use…<\/p>\n","protected":false},"author":1,"featured_media":151,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[10],"tags":[20,19],"class_list":["post-155","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-code-snipperts","tag-javascript","tag-js"],"yoast_head":"\nJS Library of common functions - konstantinos.kourentzes.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kourentzes.com\/konstantinos\/index.php\/2023\/08\/11\/js-library-of-common-functions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JS Library of common functions - 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