Initial import with skill sheet working

node_modules/@seald-io/binary-search-tree/lib/customUtils.js

@@ -0,0 +1,38 @@
+/**
+ * Return an array with the numbers from 0 to n-1, in a random order
+ */
+const getRandomArray = n => {
+  if (n === 0) return []
+  if (n === 1) return [0]
+
+  const res = getRandomArray(n - 1)
+  const next = Math.floor(Math.random() * n)
+  res.splice(next, 0, n - 1) // Add n-1 at a random position in the array
+
+  return res
+}
+
+module.exports.getRandomArray = getRandomArray
+
+/*
+ * Default compareKeys function will work for numbers, strings and dates
+ */
+const defaultCompareKeysFunction = (a, b) => {
+  if (a < b) return -1
+  if (a > b) return 1
+  if (a === b) return 0
+
+  const err = new Error("Couldn't compare elements")
+  err.a = a
+  err.b = b
+  throw err
+}
+
+module.exports.defaultCompareKeysFunction = defaultCompareKeysFunction
+
+/**
+ * Check whether two values are equal (used in non-unique deletion)
+ */
+const defaultCheckValueEquality = (a, b) => a === b
+
+module.exports.defaultCheckValueEquality = defaultCheckValueEquality