From 079a9dc5ae3f6eb6b317486fa927696f31e3d5b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C3=ABl=20Lemaire?= <michael@thunderk.net>
Date: Tue, 24 Sep 2019 23:39:04 +0200
Subject: [PATCH] Added always and never

---
 README.md         |  7 +++++++
 package.json      |  4 ++--
 src/index.test.ts | 18 +++++++++++++++++-
 src/index.ts      | 10 ++++++++++
 4 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 06d69a2..e3300a9 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,13 @@ new ConstructorWithMandatoryCallback(nop)
 a === identity(a)  // => true
 ```
 
+**always** and **never** return true and false respectively
+
+```typescript
+always()  // => true
+never()  // => false
+```
+
 **partial** applies a partial configuration object as first argument of compatible functions:
 
 ```typescript
diff --git a/package.json b/package.json
index f1792cb..9892afa 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tk-functional",
-  "version": "0.1.2",
+  "version": "0.1.3",
   "description": "Typescript/Javascript helpers for functional-style programming",
   "source": "src/index.ts",
   "main": "dist/tk-functional.js",
@@ -26,4 +26,4 @@
     "tk-base": "^0.1.7"
   },
   "dependencies": {}
-}
\ No newline at end of file
+}
diff --git a/src/index.test.ts b/src/index.test.ts
index b0c8694..897a946 100644
--- a/src/index.test.ts
+++ b/src/index.test.ts
@@ -1,4 +1,4 @@
-import { partial, cmp, nop, identity } from "./index";
+import { always, cmp, identity, never, nop, partial } from "./index";
 
 describe("nop", () => {
   it("does nothing", () => {
@@ -35,3 +35,19 @@ describe("cmp", () => {
     expect(["c", "a", "b"].sort(cmp())).toEqual(["a", "b", "c"]);
   });
 });
+
+describe("always", () => {
+  it("returns true", () => {
+    expect(always()).toBe(true);
+    expect(always(true)).toBe(true);
+    expect(always(false)).toBe(true);
+  });
+});
+
+describe("never", () => {
+  it("returns false", () => {
+    expect(never()).toBe(false);
+    expect(never(true)).toBe(false);
+    expect(never(false)).toBe(false);
+  });
+});
diff --git a/src/index.ts b/src/index.ts
index 5e59064..9c7886b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -37,3 +37,13 @@ export function cmp(args?: Partial<cmpArgs>): (a: any, b: any) => number {
     }
   }
 }
+
+/**
+ * Predicate that always returns true
+ */
+export const always = (...args: any[]) => true
+
+/**
+ * Predicate that always returns false
+ */
+export const never = (...args: any[]) => false