From 37bc6788a849b072e3f0ae7656214fba8c86e68d Mon Sep 17 00:00:00 2001
From: David Chambers <dc@davidchambers.me>
Date: Sat, 19 Sep 2015 14:45:07 -0700
Subject: [PATCH] correct the definition of higher-order functions, and update
 examples

---
 readme.md | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/readme.md b/readme.md
index 2318509..aca6440 100644
--- a/readme.md
+++ b/readme.md
@@ -19,16 +19,28 @@ console.log(arity);
 ```
 ---
 
-## Higher Order Functions (HOF)
+## Higher-Order Functions (HOF)
 
-> A function for which both the input and the output are functions.
+> A function which takes a function as an argument and/or returns a function.
 
 ```js
-let greet = (name) => () => `Hello ${name}!`;
+const filter = (pred, xs) => {
+  const result = [];
+  for (var idx = 0; idx < xs.length; idx += 1) {
+    if (pred(xs[idx])) {
+      result.push(xs[idx]);
+    }
+  }
+  return result;
+};
 ```
 
 ```js
-greet("HOF")(); // Hello HOF!
+const is = type => x => Object(x) instanceof type;
+```
+
+```js
+filter(is(Number), [0, '1', 2, null]); //=> [0, 2]
 ```
 
 ## Partial Application