add round and filterVals functions from hurdak

packages/lib/src/Tools.ts

@@ -413,6 +413,15 @@ export const toggle = <T>(x: T, xs: T[]) => (xs.includes(x) ? remove(x, xs) : ap
  */
 export const clamp = ([min, max]: [number, number], n: number) => Math.min(max, Math.max(min, n))
 
+/**
+ * Round a number to the nearest float precision
+ * @param precision - Number of decimal places
+ * @param x - Number to round
+ * @returns Formatted number
+ */
+export const round = (precision: number, x: number) =>
+  Math.round(x * Math.pow(10, precision)) / Math.pow(10, precision)
+
 /**
  * Safely parses JSON string
  * @param json - JSON string to parse
@@ -663,6 +672,24 @@ export const fromPairs = <T>(pairs: [k?: string, v?: T, ...args: unknown[]][]) =
   return r
 }
 
+/**
+ * Filters object values based on predicate
+ * @param f - Function to test values
+ * @param x - Object to filter
+ * @returns Object with only values that pass predicate
+ */
+export const filterVals = (f: (v: any) => boolean, x: Record<string, any>) => {
+  const r = {} as Record<string, any>
+
+  for (const k in x) {
+    if (f(x[k])) {
+      r[k] = x[k]
+    }
+  }
+
+  return r
+}
+
 /**
  * Flattens array of arrays into single array
  * @param xs - Array of arrays to flatten