1 files changed, 25 insertions, 0 deletions
diff --git a/src/utils/anonymous.ts b/src/utils/anonymous.ts
new file mode 100644
index 0000000..ddd28bd
--- /dev/null
+++ b/src/utils/anonymous.ts
@@ -0,0 +1,25 @@
+export const identity = <T>(x: T): T => x;
+export const defined = <T>(x: T | undefined | null): x is T =>
+  x !== undefined && x !== null;
+export const instanciate = <T, A>(C: new (arg: A) => T): (arg: A) => T => {
+  return (arg: A): T => new C(arg);
+};
+export const get = <T extends Record<K, unknown>, K extends PropertyKey>(
+  key: K,
+): (obj: T) => T[K] =>
+(obj: T): T[K] => obj[key];
+export const getCall = <
+  T extends Record<K, (...args: unknown[]) => unknown>,
+  K extends PropertyKey,
+>(
+  key: K,
+  ...args: Parameters<T[K]>
+): (obj: T) => ReturnType<T[K]> =>
+(obj: T): ReturnType<T[K]> => obj[key](...args) as ReturnType<T[K]>;
+export const pass = <T>(fn: (x: T) => void): (x: T) => T => (x: T): T => {
+  fn(x);
+  return x;
+};
+export const equal = <T>(x: T): (y: T) => boolean => (y: T): boolean => x === y;
+export const extremeBy = (arr: number[], mode: "max" | "min"): number =>
+  Math[mode](...arr);