Git is a distributed version control system DVCS designed for efficient source code management, suitable for both small and large projects. It allows multiple developers to work on a project simultaneously without overwriting changes, supporting collaborative work, continuous integration, and deployment. This Git and GitHub tutorial is designed for beginners to learn fundamentals and advanced concepts, including branching, pushing, merging conflicts, and essential Git commands. Prerequisites include familiarity with the command line interface CLI, a text editor, and basic programming concepts. Git was developed by Linus Torvalds for Linux kernel development and tracks changes, manages versions, and enables collaboration among developers. It provides a complete backup of project history in a repository. GitHub is a hosting service for Git repositories, facilitating project access, collaboration, and version control. The tutorial covers topics such as Git installation, repository creation, Git Bash usage, managing branches, resolving conflicts, and working with platforms like Bitbucket and GitHub. The text is a comprehensive guide to using Git and GitHub, covering a wide range of topics. It includes instructions on working directories, using submodules, writing good commit messages, deleting local repositories, and understanding Git workflows like Git Flow versus GitHub Flow. There are sections on packfiles, garbage collection, and the differences between concepts like HEAD, working tree, and index. Installation instructions for Git across various platforms Ubuntu, macOS, Windows, Raspberry Pi, Termux, etc. are provided, along with credential setup. The guide explains essential Git commands, their usage, and advanced topics like debugging, merging, rebasing, patch operations, hooks, subtree, filtering commit history, and handling merge conflicts. It also covers managing branches, syncing forks, searching errors, and differences between various Git operations e.g., push origin vs. push origin master, merging vs. rebasing. The text provides a comprehensive guide on using Git and GitHub. It covers creating repositories, adding code of conduct, forking and cloning projects, and adding various media files to a repository. The text explains how to push projects, handle authentication issues, solve common Git problems, and manage repositories. It discusses using different IDEs like VSCode, Android Studio, and PyCharm, for Git operations, including creating branches and pull requests. Additionally, it details deploying applications to platforms like Heroku and Firebase, publishing static websites on GitHub Pages, and collaborating on GitHub. Other topics include the use of Git with R and Eclipse, configuring OAuth apps, generating personal access tokens, and setting up GitLab repositories. The text covers various topics related to Git, GitHub, and other version control systems Key Pointers Git is a distributed version control system DVCS for source code management. Supports collaboration, continuous integration, and deployment. Suitable for both small and large projects. Developed by Linus Torvalds for Linux kernel development. Tracks changes, manages versions, and provides complete project history. GitHub is a hosting service for Git repositories. Tutorial covers Git and GitHub fundamentals and advanced concepts. Includes instructions on installation, repository creation, and Git Bash usage. Explains managing branches, resolving conflicts, and using platforms like Bitbucket and GitHub. Covers working directories, submodules, commit messages, and Git workflows. Details packfiles, garbage collection, and Git concepts HEAD, working tree, index. Provides Git installation instructions for various platforms. Explains essential Git commands and advanced topics debugging, merging, rebasing. Covers branch management, syncing forks, and differences between Git operations. Discusses using different IDEs for Git operations and deploying applications. Details using Git with R, Eclipse, and setting up GitLab repositories. Explains CI/CD processes and using GitHub Actions. Covers internal workings of Git and its decentralized model. Highlights differences between Git version control system and GitHub hosting platform.
Codes & Logic Behind JavaScript Currency Converter App
In the JavaScript file (country-list.js), I stored all possible country code and their currency code as an object. Then in the script.js file, first, I created an options tag and added those currency codes inside each option tag using for-in loop and inserted these tags inside the select tag.
After this, I created a function and got the user-entered amount. Then I sent a get request to an exchange rate API by passing the user selected “from” currency code. API returned an object of the all-country currency conversion rate of the user-selected “from” currency.
Firstly, I got the user selected “to” currency conversion rate, and then I calculate it with the user-entered amount and show it in the exchange rate text. Once it’s done, for swapping the currency codes, I just reversed the “from” currency to “to” currency and then call the function. For flags, I used countryflags.io API to show the user-selected country flag
Currency Converter App in JavaScript
To create this project (Currency Converter in JavaScript). First, you need to create four Files: HTML, CSS & JavaScript Files. After creating these files just paste the following codes into your file.HTML
First, create an HTML file with the name ofindex.html and copy paste the given codes in your HTML file. Remember, you’ve to create a file with .html extension.
<!DOCTYPE html>
<!-- Coding By Codegyan - codegyan.in -->
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title>Currency Converter App in JavaScript | Codegyan</title>
<link rel="stylesheet" href="style.css">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- FontAweome CDN Link for Icons -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css"/>
</head>
<body>
<div class="wrapper">
<header>Currency Converter</header>
<form action="#">
<div class="amount">
<p>Enter Amount</p>
<input type="text" value="1">
</div>
<div class="drop-list">
<div class="from">
<p>From</p>
<div class="select-box">
<img src="https://flagcdn.com/48x36/us.png" alt="flag">
<select> <!-- Options tag are inserted from JavaScript --> </select>
</div>
</div>
<div class="icon"><i class="fas fa-exchange-alt"></i></div>
<div class="to">
<p>To</p>
<div class="select-box">
<img src="https://flagcdn.com/48x36/np.png" alt="flag">
<select> <!-- Options tag are inserted from JavaScript --> </select>
</div>
</div>
</div>
<div class="exchange-rate">Getting exchange rate...</div>
<button>Get Exchange Rate</button>
</form>
</div>
<!--- JavaScript ----->
<script src="js/country-list.js"></script>
<script src="js/script.js"></script>
</body>
</html>CSS
Second, create a CSS file with the name of style.css and paste the given codes in your CSS file. Remember, you’ve to create a file with .css extension.
/* Import Google Font - Poppins */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');
*{
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: 'Poppins', sans-serif;
}
body{
display: flex;
align-items: center;
justify-content: center;
min-height: 100vh;
padding: 0 10px;
background: #675AFE;
}
::selection{
color: #fff;
background: #675AFE;
}
.wrapper{
width: 370px;
padding: 30px;
border-radius: 7px;
background: #fff;
box-shadow: 7px 7px 20px rgba(0, 0, 0, 0.05);
}
.wrapper header{
font-size: 28px;
font-weight: 500;
text-align: center;
}
.wrapper form{
margin: 40px 0 20px 0;
}
form :where(input, select, button){
width: 100%;
outline: none;
border-radius: 5px;
border: none;
}
form p{
font-size: 18px;
margin-bottom: 5px;
}
form input{
height: 50px;
font-size: 17px;
padding: 0 15px;
border: 1px solid #999;
}
form input:focus{
padding: 0 14px;
border: 2px solid #675AFE;
}
form .drop-list{
display: flex;
margin-top: 20px;
align-items: center;
justify-content: space-between;
}
.drop-list .select-box{
display: flex;
width: 115px;
height: 45px;
align-items: center;
border-radius: 5px;
justify-content: center;
border: 1px solid #999;
}
.select-box img{
max-width: 21px;
}
.select-box select{
width: auto;
font-size: 16px;
background: none;
margin: 0 -5px 0 5px;
}
.select-box select::-webkit-scrollbar{
width: 8px;
}
.select-box select::-webkit-scrollbar-track{
background: #fff;
}
.select-box select::-webkit-scrollbar-thumb{
background: #888;
border-radius: 8px;
border-right: 2px solid #ffffff;
}
.drop-list .icon{
cursor: pointer;
margin-top: 30px;
font-size: 22px;
}
form .exchange-rate{
font-size: 17px;
margin: 20px 0 30px;
}
form button{
height: 52px;
color: #fff;
font-size: 17px;
cursor: pointer;
background: #675AFE;
transition: 0.3s ease;
}
form button:hover{
background: #4534fe;
}
let country_list = {
"AED" : "AE",
"AFN" : "AF",
"XCD" : "AG",
"ALL" : "AL",
"AMD" : "AM",
"ANG" : "AN",
"AOA" : "AO",
"AQD" : "AQ",
"ARS" : "AR",
"AUD" : "AU",
"AZN" : "AZ",
"BAM" : "BA",
"BBD" : "BB",
"BDT" : "BD",
"XOF" : "BE",
"BGN" : "BG",
"BHD" : "BH",
"BIF" : "BI",
"BMD" : "BM",
"BND" : "BN",
"BOB" : "BO",
"BRL" : "BR",
"BSD" : "BS",
"NOK" : "BV",
"BWP" : "BW",
"BYR" : "BY",
"BZD" : "BZ",
"CAD" : "CA",
"CDF" : "CD",
"XAF" : "CF",
"CHF" : "CH",
"CLP" : "CL",
"CNY" : "CN",
"COP" : "CO",
"CRC" : "CR",
"CUP" : "CU",
"CVE" : "CV",
"CYP" : "CY",
"CZK" : "CZ",
"DJF" : "DJ",
"DKK" : "DK",
"DOP" : "DO",
"DZD" : "DZ",
"ECS" : "EC",
"EEK" : "EE",
"EGP" : "EG",
"ETB" : "ET",
"EUR" : "FR",
"FJD" : "FJ",
"FKP" : "FK",
"GBP" : "GB",
"GEL" : "GE",
"GGP" : "GG",
"GHS" : "GH",
"GIP" : "GI",
"GMD" : "GM",
"GNF" : "GN",
"GTQ" : "GT",
"GYD" : "GY",
"HKD" : "HK",
"HNL" : "HN",
"HRK" : "HR",
"HTG" : "HT",
"HUF" : "HU",
"IDR" : "ID",
"ILS" : "IL",
"INR" : "IN",
"IQD" : "IQ",
"IRR" : "IR",
"ISK" : "IS",
"JMD" : "JM",
"JOD" : "JO",
"JPY" : "JP",
"KES" : "KE",
"KGS" : "KG",
"KHR" : "KH",
"KMF" : "KM",
"KPW" : "KP",
"KRW" : "KR",
"KWD" : "KW",
"KYD" : "KY",
"KZT" : "KZ",
"LAK" : "LA",
"LBP" : "LB",
"LKR" : "LK",
"LRD" : "LR",
"LSL" : "LS",
"LTL" : "LT",
"LVL" : "LV",
"LYD" : "LY",
"MAD" : "MA",
"MDL" : "MD",
"MGA" : "MG",
"MKD" : "MK",
"MMK" : "MM",
"MNT" : "MN",
"MOP" : "MO",
"MRO" : "MR",
"MTL" : "MT",
"MUR" : "MU",
"MVR" : "MV",
"MWK" : "MW",
"MXN" : "MX",
"MYR" : "MY",
"MZN" : "MZ",
"NAD" : "NA",
"XPF" : "NC",
"NGN" : "NG",
"NIO" : "NI",
"NPR" : "NP",
"NZD" : "NZ",
"OMR" : "OM",
"PAB" : "PA",
"PEN" : "PE",
"PGK" : "PG",
"PHP" : "PH",
"PKR" : "PK",
"PLN" : "PL",
"PYG" : "PY",
"QAR" : "QA",
"RON" : "RO",
"RSD" : "RS",
"RUB" : "RU",
"RWF" : "RW",
"SAR" : "SA",
"SBD" : "SB",
"SCR" : "SC",
"SDG" : "SD",
"SEK" : "SE",
"SGD" : "SG",
"SKK" : "SK",
"SLL" : "SL",
"SOS" : "SO",
"SRD" : "SR",
"STD" : "ST",
"SVC" : "SV",
"SYP" : "SY",
"SZL" : "SZ",
"THB" : "TH",
"TJS" : "TJ",
"TMT" : "TM",
"TND" : "TN",
"TOP" : "TO",
"TRY" : "TR",
"TTD" : "TT",
"TWD" : "TW",
"TZS" : "TZ",
"UAH" : "UA",
"UGX" : "UG",
"USD" : "US",
"UYU" : "UY",
"UZS" : "UZ",
"VEF" : "VE",
"VND" : "VN",
"VUV" : "VU",
"YER" : "YE",
"ZAR" : "ZA",
"ZMK" : "ZM",
"ZWD" : "ZW"
}JS
Lastly, You have to create a JavaScript file with the name of script.js and paste the given codes in your JavaScript file. You’ve to create a file with .js extension and remember you have to pass your API key in the API URL otherwise this currency converter won’t work and it returns “something went wrong” error. You can get this key from the official ExchageRateAPI site for free.
const dropList = document.querySelectorAll("form select"),
fromCurrency = document.querySelector(".from select"),
toCurrency = document.querySelector(".to select"),
getButton = document.querySelector("form button");
for (let i = 0; i < dropList.length; i++) {
for(let currency_code in country_list){
let selected = i == 0 ? currency_code == "USD" ? "selected" : "" : currency_code == "NPR" ? "selected" : "";
let optionTag = `<option value="${currency_code}" ${selected}>${currency_code}</option>`;
dropList[i].insertAdjacentHTML("beforeend", optionTag);
}
dropList[i].addEventListener("change", e =>{
loadFlag(e.target);
});
}
function loadFlag(element){
for(let code in country_list){
if(code == element.value){
let imgTag = element.parentElement.querySelector("img");
imgTag.src = `https://flagcdn.com/48x36/${country_list[code].toLowerCase()}.png`;
}
}
}
window.addEventListener("load", ()=>{
getExchangeRate();
});
getButton.addEventListener("click", e =>{
e.preventDefault();
getExchangeRate();
});
const exchangeIcon = document.querySelector("form .icon");
exchangeIcon.addEventListener("click", ()=>{
let tempCode = fromCurrency.value;
fromCurrency.value = toCurrency.value;
toCurrency.value = tempCode;
loadFlag(fromCurrency);
loadFlag(toCurrency);
getExchangeRate();
})
function getExchangeRate(){
const amount = document.querySelector("form input");
const exchangeRateTxt = document.querySelector("form .exchange-rate");
let amountVal = amount.value;
if(amountVal == "" || amountVal == "0"){
amount.value = "1";
amountVal = 1;
}
exchangeRateTxt.innerText = "Getting exchange rate...";
let url = `https://v6.exchangerate-api.com/v6/YOUR-API-KEY/latest/${fromCurrency.value}`;
fetch(url).then(response => response.json()).then(result =>{
let exchangeRate = result.conversion_rates[toCurrency.value];
let totalExRate = (amountVal * exchangeRate).toFixed(2);
exchangeRateTxt.innerText = `${amountVal} ${fromCurrency.value} = ${totalExRate} ${toCurrency.value}`;
}).catch(() =>{
exchangeRateTxt.innerText = "Something went wrong";
});
}Also Read : Facebook Wow Reaction Emoji in HTML & CSSIf you wann to check the demo of this code, then you can check using below demo button. Click on the following download button to download all source code files of Currency Converter App directly on your computer.
