refactor: format and lint codebase (#971)

app/assets/javascripts/Utils/StringUtils.ts

@@ -0,0 +1,29 @@
+export const splitRangeWithinString = (string: string, start: number, end: number) => {
+  const isStartOutOfBounds = start > string.length || start < 0
+  const isEndOutOfBounds = end > string.length || end < 0
+  const isInvalidRange = start > end
+
+  if (isStartOutOfBounds || isEndOutOfBounds || isInvalidRange) {
+    return [string]
+  } else {
+    return [string.slice(0, start), string.slice(start, end), string.slice(end)].filter(
+      (slice) => slice.length > 0,
+    )
+  }
+}
+
+export const getIndexOfQueryInString = (string: string, query: string) => {
+  const lowercasedTitle = string.toLowerCase()
+  const lowercasedQuery = query.toLowerCase()
+  return lowercasedTitle.indexOf(lowercasedQuery)
+}
+
+export const splitQueryInString = (string: string, query: string) => {
+  const indexOfQueryInTitle = getIndexOfQueryInString(string, query)
+
+  if (indexOfQueryInTitle < 0) {
+    return [string]
+  }
+
+  return splitRangeWithinString(string, indexOfQueryInTitle, indexOfQueryInTitle + query.length)
+}