Release 0.1.0

src/utils/hooks.js

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+/*
+ * Copyright (C) 2019 CZ.NIC z.s.p.o. (http://www.nic.cz/)
+ *
+ * This is free software, licensed under the GNU General Public License v3.
+ * See /LICENSE for more information.
+ */
+
+import { useState, useEffect } from "react";
+
+/** Execute callback when condition is set to true. */
+export function useConditionalTimeout({ callback, timeout = 125 }, ...callbackArgs) {
+    const [condition, setCondition] = useState(false);
+    useEffect(() => {
+        if (condition) {
+            const interval = setTimeout(() => callback(...callbackArgs), timeout);
+            return () => setTimeout(interval);
+        }
+    }, [condition, callback, timeout, callbackArgs]);
+    return setCondition;
+}

src/utils/objectHelpers.js

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+/*
+ * Copyright (C) 2019 CZ.NIC z.s.p.o. (http://www.nic.cz/)
+ *
+ * This is free software, licensed under the GNU General Public License v3.
+ * See /LICENSE for more information.
+ */
+
+/** Return undefined if object has no keys, otherwise return object. */
+export function undefinedIfEmpty(instance) {
+    if (Object.keys(instance).length > 0) {
+        return instance;
+    }
+    return undefined;
+}
+
+/** Return object without keys that have undefined value. */
+export function withoutUndefinedKeys(instance) {
+    return Object.keys(instance).reduce(
+        (accumulator, key) => {
+            if (instance[key] !== undefined) {
+                accumulator[key] = instance[key];
+            }
+            return accumulator;
+        },
+        {},
+    );
+}
+
+/** Return copy of passed object that has only desired keys. */
+export function onlySpecifiedKeys(object, desiredKeys) {
+    return desiredKeys.reduce(
+        (accumulator, key) => { accumulator[key] = object[key]; return accumulator; },
+        {},
+    );
+}