refactor: ♻️ restructure character data files, move shared functionality into library

src/includes/util.js

@@ -0,0 +1,73 @@
+const getClientLocale = () => {
+  return navigator.languages.length > 0 ? navigator.languages[0] : 'en-US';
+};
+
+const getAge = (dateOfBirth) => {
+  const today = new Date();
+
+  const thisYear = today.getFullYear();
+  const thisMonth = today.getMonth();
+  const thisDay = today.getDate();
+
+  const dobYear = dateOfBirth.getFullYear();
+  const dobMonth = dateOfBirth.getMonth();
+  const dobDay = dateOfBirth.getDate();
+
+  let age = thisYear - dobYear;
+
+  if (thisMonth < dobMonth) age--;
+  if (thisMonth === dobMonth && thisDay < dobDay) age--;
+
+  return age;
+};
+
+const toImperial = (cm) => {
+  const realFeet = (cm * 0.3937) / 12;
+  const feet = Math.floor(realFeet);
+  const inches = Math.round((realFeet - feet) * 12);
+
+  return `${feet}'${inches}"`;
+};
+
+const toInch = (cm) => {
+  return `${Math.round(cm / 2.45)} in`;
+};
+
+const toLbs = (kg) => {
+  const nearExact = kg / 0.45359237;
+  const lbs = Math.floor(nearExact);
+
+  return lbs;
+};
+
+const toFahrenheit = (celsius) => {
+  return celsius * 1.8 + 32;
+};
+
+const dateFormat = new Intl.DateTimeFormat(getClientLocale(), {
+  year: 'numeric',
+  month: 'long',
+  day: '2-digit'
+});
+
+const getFullName = (...names) => names.join(' ');
+const getDateOfBirth = (dob) => `${dateFormat.format(dob)} (${getAge(dob)})`;
+const getHeight = (height) => `${height} cm (${toImperial(height)})`;
+const getWeight = (weight) => `${weight} kg (${toLbs(weight)} lbs)`;
+const getTailLength = (length) => `${length / 100} m (${toImperial(length)})`;
+const getWingspan = (wingspan) => `${wingspan / 100} m (${toImperial(wingspan)})`;
+
+export {
+  getAge,
+  toImperial,
+  toInch,
+  toLbs,
+  toFahrenheit,
+  dateFormat,
+  getFullName,
+  getDateOfBirth,
+  getHeight,
+  getWeight,
+  getTailLength,
+  getWingspan
+};