finished project

.gitignore

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+# dependencies
+/node_modules
+
+# design
+/design
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+

README.md

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+# Another Calculator
+
+I've taken Frontend-Mentor challenge [https://www.frontendmentor.io/challenges/calculator-app-9lteq5N29](challenge link) and created this calculator.
+
+## Table of contents
+
+- [Overview](#overview)
+  - [The challenge](#the-challenge)
+  - [Screenshot](#screenshot)
+  - [Links](#links)
+- [My process](#my-process)
+  - [Built with](#built-with)
+  - [Useful resources](#useful-resources)
+- [Author](#author)
+
+## Overview
+
+### The Challenge
+
+Users should be able to:
+
+- See the size of the elements adjust based on their device's screen size
+- Perform mathmatical operations like addition, subtraction, multiplication, and division
+- Adjust the color theme based on their preference
+- Have their theme preference check and saved
+
+### Screenshot
+
+![desktop-purple](./public/desktop-purple.png)
+
+![landscape-light](./public/landscape-light.png)
+
+![mobile-blue](./public/mobile-blue.png)
+
+### Links
+
+- [Solution URL](https://github.com/yusufipk/another-calculator)
+- [Live Site URL](https://yusufipk.github.io/another-calculator/)
+
+## My process
+
+### Built With
+
+- HTML5
+- CSS custom properties
+- Grid
+- Flexbox
+- Desktop-first workflow
+
+### Useful Resources
+
+- [Saving theme with localstorage](https://dev.to/mritunjaysaha/theme-switching-using-local-storage-13i) - This article shows you how to save themes using localstorage.
+
+## Author
+
+- Website - [Yusuf İpek](https://yusufipek.me)
+- Frontend Mentor - [@yusufipk](https://www.frontendmentor.io/profile/yusufipk)
+- Youtube - [Youtube](https://www.youtube.com/channel/UCVBX2n_5egE9XuJL8NUS0Xg)

css/App.css

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+:root {
+  --color-main: #3b4664;
+  --color-white: #ffffff;
+
+  --bg-main: #181f32;
+  --bg-buttons: rgba(37, 45, 68, 0.6);
+
+  --num: #eae3db;
+  --number-color: #484b5a;
+  --number-border: #b3a599;
+  --button-secondary: #647299;
+  --border-secondary: #404d70;
+  --button-tertiary: #d13f30;
+  --border-tertiary: #922417;
+  --radio-color: #cf3f34;
+}
+
+body[data-theme="light"] {
+  --color-main: #e6e6e6;
+  --color-white: #3a3a32;
+
+  --bg-main: #eeeeee;
+  --bg-buttons: #d3cdcd;
+
+  --num: #e5e4e0;
+  --number-color: #3a3a32;
+  --number-border: #a69c93;
+  --button-secondary: #388187;
+  --border-secondary: #1a5d66;
+  --button-tertiary: #c85401;
+  --border-tertiary: #873a02;
+}
+
+body[data-theme="purple"] {
+  --color-main: #17062a;
+  --color-white: #ffe43b;
+
+  --bg-main: #1e0836;
+  --bg-buttons: #1e0836;
+
+  --num: #331b4d;
+  --number-color: #ffe537;
+  --number-border: #85219b;
+  --button-secondary: #56077c;
+  --border-secondary: #bf15f4;
+  --button-tertiary: #00decf;
+  --border-tertiary: #6dfaf1;
+  --radio-color: #00e8d8;
+}
+
+*,
+*::after,
+*::before {
+  margin: 0;
+  padding: 0;
+  box-sizing: inherit;
+}
+
+html {
+  font-size: 62.5%;
+}
+
+@media screen and (max-width: 550px) {
+  html {
+    font-size: 50%;
+  }
+}
+
+body {
+  box-sizing: border-box;
+  background-color: var(--color-main);
+  color: var(--color-white);
+
+  transition: background-color 0.5s;
+}
+
+/* LAYOUT */
+
+.container {
+  display: grid;
+  justify-content: center;
+  align-content: center;
+  min-height: 100vh;
+
+  grid-template-columns: repeat(4, 12rem);
+  grid-template-rows: 7rem minmax(12rem, auto) auto;
+}
+
+.theme {
+  grid-row: 2;
+  grid-column: 4;
+
+  display: grid;
+  grid-template-rows: repeat(2, 1fr);
+
+  justify-items: right;
+}
+
+/* HEADER */
+
+.header {
+  grid-column: 1/-1;
+  align-items: center;
+
+  /* display: flex; */
+  /* justify-content: space-between; */
+
+  display: grid;
+  grid-template-columns: repeat(4, 1fr);
+  grid-template-rows: repeat(2, 1fr);
+}
+
+.header h4 {
+  grid-row: 2;
+  font-size: 3rem;
+  margin-bottom: -1.2rem;
+}
+
+.header p {
+  font-size: 1.2rem;
+  font-weight: 800;
+
+  margin-left: 1.5rem;
+
+  grid-row: 2;
+  grid-column: 3;
+
+  display: flex;
+  align-self: flex-end;
+  justify-self: right;
+  margin-bottom: 3px;
+  margin-right: -5rem;
+}
+
+/* DISPLAY */
+
+.display {
+  grid-column: 1/-1;
+
+  background-color: var(--bg-main);
+  border-radius: 5px;
+  padding: 10px;
+  margin-top: 1.5rem;
+
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+  justify-content: space-around;
+
+  word-wrap: break-word;
+  word-break: break-all;
+
+  margin-bottom: 1.3rem;
+}
+
+.display .previousOperand {
+  font-size: 2rem;
+}
+
+.display .currentOperand {
+  font-size: 3rem;
+}
+
+/* BUTTONS */
+
+.buttons {
+  background-color: var(--bg-buttons);
+  grid-column: 1 / -1;
+
+  display: grid;
+  grid-gap: 1.5rem;
+  border-radius: 5px;
+
+  justify-items: center;
+  justify-content: center;
+
+  grid-template-columns: repeat(4, 100px);
+
+  padding: 3rem;
+}
+
+.span-2 {
+  width: 100%;
+  grid-column: span 2;
+}
+
+button {
+  outline: none;
+  cursor: pointer;
+
+  width: 100%;
+  padding-top: 0.5rem;
+  padding-bottom: 0.5rem;
+
+  background-color: var(--num);
+  color: var(--number-color);
+  font-size: 3.3rem;
+  font-weight: 900;
+  border: none;
+  border-radius: 10px;
+
+  box-shadow: 0 4px var(--number-border);
+}
+
+button:active {
+  box-shadow: 0 2px var(--number-border);
+}
+
+@media screen and (max-width: 550px) {
+  .buttons {
+    grid-template-columns: repeat(4, 80px);
+  }
+  button {
+    padding: 0;
+    border-radius: 8px;
+  }
+}
+
+@media screen and (max-width: 415px) {
+  .container {
+    grid-template-columns: repeat(4, 10rem);
+  }
+  .buttons {
+    grid-template-columns: repeat(4, 65px);
+  }
+  button {
+    padding: 0;
+  }
+
+  .radio {
+    width: 55% !important;
+  }
+
+  .header p {
+    margin-right: -4rem;
+  }
+}
+@media screen and (max-width: 370px) {
+  .container {
+    grid-template-columns: repeat(4, 9rem);
+  }
+  .buttons {
+    grid-template-columns: repeat(4, 55px);
+  }
+  .radio {
+    width: 60% !important;
+  }
+  .header p {
+    margin-right: -3rem;
+  }
+  button {
+    padding: 0;
+    border-radius: 8px;
+  }
+  .blue {
+    font-size: 1.8rem !important;
+  }
+}
+
+.blue {
+  background-color: var(--button-secondary);
+  color: #ffffff;
+  font-size: 2.2rem;
+  padding: 1.3rem;
+  box-shadow: 0 4px var(--border-secondary);
+}
+
+.blue:active {
+  box-shadow: 0 2px var(--border-secondary);
+}
+
+.red {
+  background-color: var(--button-tertiary);
+  color: #ffffff;
+  font-size: 2.2rem;
+  box-shadow: 0 4px var(--border-tertiary);
+}
+
+.red:active {
+  box-shadow: 0 2px var(--border-tertiary);
+}
+
+/* radio */
+
+.radio {
+  background-color: var(--bg-buttons);
+  padding: 0.4rem 0.4rem 0.3rem 0.3rem;
+  border-radius: 0.9rem;
+
+  grid-row: 2;
+  grid-column: 1/-1;
+  width: 46%;
+}
+
+input[type="radio"] {
+  -webkit-appearance: none;
+  -moz-appearance: none;
+  appearance: none;
+  opacity: 0;
+  cursor: pointer;
+  width: 1rem;
+  height: 1rem;
+  border-radius: 1rem;
+  margin-left: 0.4rem;
+}
+input[type="radio"]:checked {
+  display: inline-block;
+
+  opacity: 1;
+  background-color: var(--radio-color);
+  border-color: var(--radio-color);
+}
+
+.labels {
+  grid-column: 1/-1;
+
+  letter-spacing: 0.35rem;
+  font-size: 1.4rem;
+}

package-lock.json

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+{
+  "name": "another-calculator-app",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "version": "1.0.0",
+      "license": "ISC"
+    }
+  }
+}

package.json

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+{
+  "name": "another-calculator-app",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}

src/app.js

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+// Theme
+const theme1 = document.getElementById("theme1");
+const theme2 = document.getElementById("theme2");
+const theme3 = document.getElementById("theme3");
+
+if (localStorage.getItem("theme") === null) {
+  localStorage.setItem("theme", "theme1");
+}
+
+switch (localStorage.getItem("theme")) {
+  case "theme1":
+    theme1.checked = true;
+    break;
+  case "theme2":
+    theme2.checked = true;
+    break;
+  case "theme3":
+    theme3.checked = true;
+    break;
+}
+
+theme1.addEventListener("click", () => {
+  theme2.checked = false;
+  theme3.checked = false;
+  localStorage.setItem("theme", "theme1");
+});
+theme1.addEventListener("click", changeTheme);
+
+theme2.addEventListener("click", () => {
+  theme1.checked = false;
+  theme3.checked = false;
+  localStorage.setItem("theme", "theme2");
+});
+theme2.addEventListener("click", changeTheme);
+
+theme3.addEventListener("click", () => {
+  theme1.checked = false;
+  theme2.checked = false;
+  localStorage.setItem("theme", "theme3");
+});
+theme3.addEventListener("click", changeTheme);
+
+function changeTheme() {
+  if (theme1.checked) {
+    document.body.setAttribute("data-theme", "");
+  } else if (theme2.checked) {
+    document.body.setAttribute("data-theme", "light");
+  } else if (theme3.checked) {
+    document.body.setAttribute("data-theme", "purple");
+  }
+}
+
+changeTheme();
+
+// Functionality
+class Calculator {
+  constructor(prevOperandTextElement, currentOperandElement) {
+    this.prevOperandTextElement = prevOperandTextElement;
+    this.currentOperandTextElement = currentOperandTextElement;
+    this.clear();
+  }
+
+  clear() {
+    this.currentOperand = "";
+    this.prevOperand = "";
+    this.operation = undefined;
+  }
+
+  delete() {
+    this.currentOperand = this.currentOperand.toString().slice("0", -1);
+  }
+
+  appendNumber(number) {
+    if (number === "." && this.currentOperand.includes(".")) return;
+    this.currentOperand =
+      this.currentOperand.toString() + number.toString("number");
+  }
+
+  chooseOperation(operation) {
+    if (this.currentOperand === "") return;
+    if (this.prevOperand !== "") {
+      this.compute();
+    }
+    this.operation = operation;
+    this.prevOperand = this.currentOperand;
+    this.currentOperand = "";
+  }
+
+  compute() {
+    let computation;
+
+    const prev = parseFloat(this.prevOperand);
+    const current = parseFloat(this.currentOperand);
+    if (isNaN(prev) || isNaN(current)) return;
+
+    switch (this.operation) {
+      case "+":
+        computation = prev + current;
+        break;
+      case "-":
+        computation = prev - current;
+        break;
+      case "/":
+        computation = prev / current;
+        break;
+      case "x":
+        computation = prev * current;
+        break;
+      case "*":
+        computation = prev * current;
+        break;
+      default:
+        return;
+    }
+    this.currentOperand = computation;
+    this.operation = undefined;
+    this.prevOperand = "";
+  }
+
+  getDisplayNumber(number) {
+    const stringNumber = number.toString();
+    const integerDigits = parseFloat(stringNumber.split(".")[0]);
+    const decimalDigits = stringNumber.split(".")[1];
+    let integerDisplay;
+    if (isNaN(integerDigits)) {
+      integerDisplay = "";
+    } else {
+      integerDisplay = integerDigits.toLocaleString("en", {
+        maximumFractionDigits: 0,
+      });
+    }
+
+    if (decimalDigits != null) {
+      return `${integerDisplay}.${decimalDigits}`;
+    } else {
+      return integerDisplay;
+    }
+  }
+
+  updateDisplay() {
+    this.currentOperandTextElement.innerText = this.getDisplayNumber(
+      this.currentOperand
+    );
+    this.prevOperandTextElement.innerText = this.getDisplayNumber(
+      this.prevOperand
+    );
+
+    if (this.operation != undefined) {
+      this.prevOperandTextElement.innerText = `${this.getDisplayNumber(
+        this.prevOperand
+      )} ${this.operation}`;
+    }
+  }
+}
+
+const numberButtons = document.querySelectorAll("[data-number]");
+const operationButtons = document.querySelectorAll("[data-operation]");
+const equalsButton = document.querySelector("[data-equals]");
+const deleteButton = document.querySelector("[data-del]");
+const reset = document.querySelector("[data-reset]");
+const prevOperandTextElement = document.querySelector(
+  "[data-previous-operand]"
+);
+const currentOperandTextElement = document.querySelector(
+  "[data-current-operand]"
+);
+
+const calculator = new Calculator(
+  prevOperandTextElement,
+  currentOperandTextElement
+);
+
+numberButtons.forEach((button) => {
+  button.addEventListener("click", () => {
+    calculator.appendNumber(button.innerText);
+    calculator.updateDisplay();
+  });
+});
+
+operationButtons.forEach((button) => {
+  button.addEventListener("click", () => {
+    calculator.chooseOperation(button.innerText);
+    calculator.updateDisplay();
+  });
+});
+
+equalsButton.addEventListener("click", (button) => {
+  calculator.compute();
+  calculator.updateDisplay();
+});
+
+reset.addEventListener("click", (button) => {
+  calculator.clear();
+  calculator.updateDisplay();
+});
+
+deleteButton.addEventListener("click", (button) => {
+  calculator.delete();
+  calculator.updateDisplay();
+});
+
+document.body.addEventListener("keydown", (e) => {
+  if (isNaN(e.key) === false || e.key === ".") {
+    calculator.appendNumber(e.key);
+    calculator.updateDisplay();
+  } else if (e.key === "+" || e.key === "/" || e.key === "*" || e.key === "-") {
+    calculator.chooseOperation(e.key);
+    calculator.updateDisplay();
+  } else if (e.key === "Enter") {
+    calculator.compute();
+    calculator.updateDisplay();
+  } else if (e.key === "Backspace") {
+    calculator.delete();
+    calculator.updateDisplay();
+  } else if (e.key === "Delete") {
+    calculator.clear();
+    calculator.updateDisplay();
+  } else {
+    return;
+  }
+});

src/index.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Another Calculator App</title>
+    <link
+      rel="stylesheet"
+      type="text/css"
+      href="../css/App.css"
+      media="screen"
+    />
+  </head>
+
+  <body>
+    <div class="container">
+      <div class="header">
+        <h4>calc</h4>
+        <p>THEME</p>
+        <div class="theme">
+          <div class="labels">
+            <label for="theme1">1</label>
+            <label for="theme2">2</label>
+            <label for="theme3">3</label>
+          </div>
+          <div class="radio">
+            <input type="radio" id="theme1" name="theme1" />
+            <input type="radio" id="theme2" name="theme2" />
+            <input type="radio" id="theme3" name="theme3" />
+          </div>
+        </div>
+      </div>
+
+      <div class="display">
+        <div data-previous-operand class="previousOperand"></div>
+        <div data-current-operand class="currentOperand"></div>
+      </div>
+
+      <div class="buttons">
+        <button data-number>7</button>
+        <button data-number>8</button>
+        <button data-number>9</button>
+        <button data-del class="blue">DEL</button>
+
+        <button data-number>4</button>
+        <button data-number>5</button>
+        <button data-number>6</button>
+        <button data-operation>+</button>
+
+        <button data-number>1</button>
+        <button data-number>2</button>
+        <button data-number>3</button>
+        <button data-operation>-</button>
+
+        <button data-number>.</button>
+        <button data-number>0</button>
+        <button data-operation>/</button>
+        <button data-operation>x</button>
+
+        <button data-reset class="span-2 blue">RESET</button>
+        <button data-equals class="span-2 red">=</button>
+      </div>
+    </div>
+
+    <script src="app.js"></script>
+  </body>
+</html>