conversions - Create `conversions.js` and move `hex2num` et al. out of `logging.js`

src/conversions.js

@@ -0,0 +1,48 @@
+/** 
+ * @param {number} num
+ * @returns {string}
+ */
+const num2hex = (num) => num.toString(16).toUpperCase().padStart(2, "0");
+
+/** 
+ * @param {string} hex
+ * @returns {number}
+ */
+const hex2num = (hex) => parseInt(hex, 16);
+
+/**
+ * Convert a number to binary, padded to 8 bits
+ * See here for an explanation: https://stackoverflow.com/questions/9939760/how-do-i-convert-an-integer-to-binary-in-javascript
+ * @param {number} num
+ * @returns {string} binary representation of the input
+ **/
+const num2bin = (num) => (num >>> 0).toString(2).padStart(8, "0");
+
+/**
+ * Convert a number to binary, padded to 4 bits
+ * See here for an explanation: https://stackoverflow.com/questions/9939760/how-do-i-convert-an-integer-to-binary-in-javascript
+ * @param {number} num
+ * @returns {string} binary representation of the input
+ **/
+const num2bin_4bit = (num) => (num >>> 0).toString(2).padStart(4, "0");
+
+/** 
+ * @param {string} bin
+ * @returns {number}
+ */
+const bin2num = (bin) => parseInt(bin, 2)
+
+/**
+ * @param {Boolean} bool
+ * @returns {0|1}
+ **/
+const bool2bit = (bool) => bool ? 1 : 0;
+
+module.exports = {
+  "num2hex": num2hex,
+  "hex2num": hex2num,
+  "num2bin": num2bin,
+  "num2bin_4bit": num2bin_4bit,
+  "bin2num": bin2num,
+  "bool2bit": bool2bit,
+}