404_Brain_not_found

calculator/Calci

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+let lightTheme = "styles/light.css";
+let darkTheme = "styles/dark.css";
+
+//adding event handler on the document to handle keyboard inputs
+document.addEventListener("keydown", keyboardInputHandler);
+
+//function to handle keyboard inputs
+function keyboardInputHandler(e) {
+  //grabbing the liveScreen
+  let res = document.getElementById("result");
+
+  //numbers
+  if (e.key === "0") {
+    res.value += "0";
+  } else if (e.key === "1") {
+    res.value += "1";
+  } else if (e.key === "2") {
+    res.value += "2";
+  } else if (e.key === "3") {
+    res.value += "3";
+  } else if (e.key === "4") {
+    res.value += "4";
+  } else if (e.key === "5") {
+    res.value += "5";
+  } else if (e.key === "6") {
+    res.value += "6";
+  } else if (e.key === "7") {
+    res.value += "7";
+  } else if (e.key === "7") {
+    res.value += "7";
+  } else if (e.key === "8") {
+    res.value += "8";
+  } else if (e.key === "9") {
+    res.value += "9";
+  }
+
+  //operators
+  if (e.key === "+") {
+    res.value += "+";
+  } else if (e.key === "-") {
+    res.value += "-";
+  } else if (e.key === "*") {
+    res.value += "*";
+  } else if (e.key === "/") {
+    res.value += "/";
+  }
+
+  //decimal key
+  if (e.key === ".") {
+    res.value += ".";
+  }
+
+  //press enter to see result
+  if (e.key === "Enter") {
+    res.value = eval(result.value || null);
+  }
+
+  //backspace for removing the last input
+  if (e.key === "Backspace") {
+    let resultInput = res.value;
+
+    //remove the last element in the string
+    res.value = resultInput.substring(0, res.value.length - 1);
+  }
+}
+
+// Clears the screen on click of C button.
+function clearScreen() {
+  document.getElementById("result").value = "";
+}
+// Displays entered value on screen.
+function liveScreen(value) {
+  let res = document.getElementById("result");
+  if (!res.value) {
+    res.value = "";
+  }
+  res.value += value;
+}
+// Swaps the stylesheet in order to  achieve dark mode.
+function changeTheme() {
+  let darkMode = document.getElementById("dark-mode");
+  let theme = document.getElementById("theme");
+  if (theme.getAttribute("href") === lightTheme) {
+    theme.href = darkTheme;
+    darkMode.innerHTML = "Light Mode 🌞";
+  } else {
+    theme.href = lightTheme;
+    darkMode.innerHTML = "Dark Mode 🌙";
+  }
+}