✨ Map

Author: UltiRequiem

src/language/filter.ts

@@ -1,4 +1,4 @@
-export type FilterCallback<T> = (
+export type FilterCallback<T = never> = (
   item: T,
   index: number,
   array: readonly T[],

src/language/map.ts

@@ -0,0 +1,17 @@
+export type MapCallback<T = never> = (
+  value: T,
+  index: number,
+  array: T[],
+) => unknown;
+
+export function map<T>(array: T[], transform: MapCallback<T>) {
+  const result: unknown[] = [];
+
+  for (const [index, value] of array.entries()) {
+    result.push(transform(value, index, array));
+  }
+
+  return result;
+}
+
+[].map;