Add custom hook for filters

src/cryptometrics/hooks/useFilters.js

+import React, { useState } from "react";
+
+/**
+ * Format of each filter should be:
+ * {
+ *  subject: "",
+ *  condition: "",
+ *  value: ""
+ * }
+ */
+export default function useFilters(initialArray) {
+  const [filters, setFilters] = useState(initialArray);
+
+  const checkIfFilterExists = (filter) => {
+    for (let i = 0; i < filters.length; i++) {
+      if (
+        filters[i].subject === filter.subject &&
+        filters[i].condition === filter.condition &&
+        filters[i].value === filter.value
+      ) {
+        return true;
+      }
+    }
+    return false;
+  };
+
+  const addFilter = (filter) => {
+    // Check if filter already exists
+    if (checkIfFilterExists(filter)) {
+      return;
+    }
+    setFilters([...filters, filter]);
+  };
+
+  const removeFilter = (filter) => {
+    setFilters(
+      filters.filter(({ subject, condition, value }) => {
+        return (
+          subject !== filter.subject &&
+          condition !== filter.condition &&
+          value !== filter.value
+        );
+      })
+    );
+  };
+  return [filters, addFilter, removeFilter];
+}