feat(m3): add solution exe 002-recursive-decimal-to-binary

projects/002-recursive-decimal-to-binary/js/index.js

@@ -0,0 +1,24 @@
+const prompt = require('prompt-sync')();
+
+/**
+ *
+ * @param {Number} userNumber - The non-negative decimal number to be converted to binary:
+ * @returns {String} - A string representing the binary equivalent of the supplied decimal number:
+ */
+const decimalToBinary = (userNumber) => {
+    return userNumber === 0 || userNumber === 1
+        ? userNumber.toString()
+        : decimalToBinary(Math.trunc(userNumber / 2)) +
+              (userNumber % 2).toString();
+}; // For numbers greater than 1, it recursively calls the function by dividing by 2 and adds the remainder of the division by 2 to the end of the resulting string.
+
+const userNumber = Number(prompt('Enter a non-negative integer'));
+if (userNumber < 0) {
+    console.log('Enter a non-negative integer');
+} else {
+    console.log(
+        `The binary equivalent of the non-negative decimal number entered by the user is: ${decimalToBinary(
+            userNumber
+        )}`
+    );
+}