fix(app): datatable global checkbox doesn't reflect the selected state (#470)

app/react/common/string-utils.ts

@@ -0,0 +1,27 @@
+export function capitalize(s: string) {
+  return s.slice(0, 1).toUpperCase() + s.slice(1);
+}
+
+export function pluralize(val: number, word: string, plural = `${word}s`) {
+  return [1, -1].includes(Number(val)) ? word : plural;
+}
+
+export function addPlural(value: number, word: string, plural = `${word}s`) {
+  return `${value} ${pluralize(value, word, plural)}`;
+}
+
+/**
+ * Joins an array of strings into a grammatically correct sentence.
+ */
+export function grammaticallyJoin(
+  values: string[],
+  separator = ', ',
+  lastSeparator = ' and '
+) {
+  if (values.length === 0) return '';
+  if (values.length === 1) return values[0];
+
+  const allButLast = values.slice(0, -1);
+  const last = values[values.length - 1];
+  return `${allButLast.join(separator)}${lastSeparator}${last}`;
+}