feat(landing): slicing navigation bar

apps/dimentorin/src/app/_components/logic/for.tsx

@@ -0,0 +1,27 @@
+export interface ForProps<T, U> {
+  data: readonly T[]
+  children: (item: T, index: number) => U | null
+  fallback?: React.ReactNode | null
+}
+
+/**
+ * A functional component that renders a list of children components from a given
+ * array of data.
+ *
+ * @param data - The array of data to render
+ * @param children - A function that takes the current item and index and returns
+ *                   the child component to render
+ * @param fallback - An optional fallback component to render when the data is empty
+ *
+ * @returns An array of rendered child components if the data is not empty, otherwise
+ *          the fallback component if it is provided, null otherwise
+ */
+export function For<T, U extends React.JSX.Element>({
+  data,
+  children,
+  fallback = null
+}: ForProps<T, U>): (U | null)[] | React.ReactNode | null {
+  if (!Array.isArray(data) || !data?.length) return fallback
+
+  return data.map((item, idx) => children(item, idx))
+}

apps/dimentorin/src/app/_components/logic/show.tsx

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+export interface ShowProps {
+  condition: boolean
+  children: React.ReactNode
+  fallback?: React.ReactNode | null
+}
+
+/**
+ * Conditionally renders the `children` component if `condition` is true. If
+ * `condition` is false, renders the `fallback` component instead.
+ *
+ * If `fallback` is `null`, renders nothing.
+ *
+ * @param condition - The condition to check
+ * @param children - The component to render if `condition` is true
+ * @param fallback - The component to render if `condition` is false
+ */
+export function Show({ condition, children, fallback = null }: ShowProps) {
+  return condition ? children : fallback
+}