diff --git a/.babelrc b/.babelrc
deleted file mode 100644
index cf31181..0000000
--- a/.babelrc
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "presets": ["es2015", "node6", "stage-2"]
-}
diff --git a/.gitignore b/.gitignore
index 3c3629e..126b9d1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 node_modules
+.esm-cache
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..9b893f6
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1485 @@
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+          "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+          "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+          "dev": true
+        }
+      }
+    },
+    "watch": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/watch/-/watch-1.0.2.tgz",
+      "integrity": "sha1-NApxe952Vyb6CqB9ch4BR6VR3ww=",
+      "dev": true,
+      "requires": {
+        "exec-sh": "0.2.1",
+        "minimist": "1.2.0"
+      },
+      "dependencies": {
+        "exec-sh": {
+          "version": "0.2.1",
+          "resolved": "https://registry.npmjs.org/exec-sh/-/exec-sh-0.2.1.tgz",
+          "integrity": "sha512-aLt95pexaugVtQerpmE51+4QfWrNc304uez7jvj6fWnN8GeEHpttB8F36n8N7uVhUMbH/1enbxQ9HImZ4w/9qg==",
+          "dev": true,
+          "requires": {
+            "merge": "1.2.0"
+          }
+        },
+        "merge": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/merge/-/merge-1.2.0.tgz",
+          "integrity": "sha1-dTHjnUlJwoGma4xabgJl6LBYlNo=",
+          "dev": true
+        },
+        "minimist": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "dev": true
+        }
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index ad8ddd8..6d097ea 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "lint": "eslint source",
-    "test": "babel-node source/test.js",
+    "test": "node -r @std/esm source/test.js",
     "watch": "watch 'clear && npm run -s lint && npm run -s test' source"
   },
   "repository": {
@@ -19,12 +19,14 @@
   },
   "homepage": "https://github.com/learn-javascript-courses/es6-curry#readme",
   "devDependencies": {
-    "babel-cli": "6.24.0",
-    "babel-preset-es2015": "6.24.0",
-    "babel-preset-node6": "11.0.0",
-    "babel-preset-stage-2": "6.22.0",
     "eslint": "3.18.0",
     "tape": "4.6.3",
     "watch": "1.0.2"
+  },
+  "dependencies": {
+    "@std/esm": "0.12.5"
+  },
+  "@std/esm": {
+    "esm": "js"
   }
 }
diff --git a/source/curry.js b/source/curry.js
index 242a2e5..3ea9b8e 100644
--- a/source/curry.js
+++ b/source/curry.js
@@ -1,8 +1,9 @@
 // Tiny, recursive autocurry
 const curry = (
-  f, arr = []
+  f, arr = [],
+  length = f.length
 ) => (...args) => (
-  a => a.length === f.length ?
+  a => a.length === length ?
     f(...a) :
     curry(f, a)
 )([...arr, ...args]);
diff --git a/source/index.js b/source/index.js
index e69de29..6165026 100644
--- a/source/index.js
+++ b/source/index.js
@@ -0,0 +1,18 @@
+import curry from './curry';
+
+export const add2 = a => b => a + b;
+
+export const add3 = curry((a, b, c) => a + b + c);
+
+export const inc = add2(1);
+
+export const compose2 = (f, g) => x => f(g(x));
+
+export const trace = label => value => {
+  console.log(`${ label }: ${ JSON.stringify(value) }`);
+  return value;
+};
+
+export const compose = (...fns) => x => fns.reduceRight((acc, fn) => fn(acc), x);
+
+export const pipe = (...fns) => x => fns.reduce((acc, fn) => fn(acc), x);
diff --git a/source/test.js b/source/test.js
index e511725..9784d94 100644
--- a/source/test.js
+++ b/source/test.js
@@ -1,10 +1,116 @@
+// ES6 Curry & Function Composition
+
 import test from 'tape';
+import { add2 } from './index';
+import { add3 } from './index';
+import { inc } from './index';
+import { compose2 } from './index';
+import { trace } from './index';
+import { compose } from './index';
+import { pipe } from './index';
+
+// What is currying?
+// add2(a) => b => Number
+test('add2(a) => b => Number', assert => {
+  const msg = 'should take two numbers and return the sum';
+
+  const actual = add2(1)(2);
+  const expected = 3;
+
+  assert.same(actual, expected, msg);
+  assert.end();
+});
+
+// What is partial application?
+// add3(a) => b => c => Number
+test('add3(a) => b => c => Number', assert => {
+  const msg = 'should auto-curry arguments and return the sum';
+
+  const expected = 6;
+
+  assert.same(add3(1, 2, 3), expected, msg);
+  assert.same(add3(1)(2)(3), expected, msg);
+  assert.same(add3(1)(2, 3), expected, msg);
+  assert.same(add3(1, 2)(3), expected, msg);
+  assert.end();
+});
+
+// What is point-free style?
+// inc(n) => Number
+test('inc(n) => Number', assert => {
+  const msg = 'should take a number a and return the sum of a and 1';
+
+  const actual = inc(4);
+  const expected = 5;
+
+  assert.same(actual, expected, msg);
+  assert.end();
+});
+
+// What is function composition?
+// compose2(f: Function, g: Function) => Function
+// Given functions f and g, return the composition f ∘ g (f after g).
+// (f ∘ g)(x) = f(g(x))
+test('compose2(f: Function, g: Function) => Function', assert => {
+  const msg = 'should take two functions, f & g, and return f ∘ g';
+
+  const g = n => n + 1;
+  const f = n => n * 2;
+  const h = compose2(f, g);
+
+  const actual = h(20);
+  const expected = 42;
+
+  assert.same(actual, expected, msg);
+  assert.end();
+});
+
+// trace
+test('trace(label) => v => v, effects(log to console)', assert => {
+  const msg = 'should take a label and value and log, "label: value"';
+
+  const actual = trace('foo')('bar');
+  const expected = 'bar';
+
+  assert.same(actual, expected, msg);
+  assert.end();
+});
+
+// How does currying help with function composition?
+// compose(...fns: [...Functions]) => Function
+test('compose(...fns: [...Function]) => Function', assert => {
+  const msg = 'should take any number of functions and return their composition';
+
+  const g = n => n + 1;
+  const f = n => n * 2;
+
+  const h = compose(
+    trace('after f'),
+    f,
+    trace('after g'),
+    g
+  );
+
+  const actual = h(20);
+  const expected = 42;
+
+  assert.same(actual, expected, msg);
+  assert.end();
+});
+
+test('pipe(...fns: [...Function]) => Function', assert => {
+  const msg = 'should take any number of functions and return their composition';
+
+  const g = n => n + 1;
+  const f = n => n * 2;
 
-test('No tests yet!', assert => {
-  const msg = 'should have tests';
+  const h = pipe(
+    f,
+    g
+  );
 
-  const actual = false;
-  const expected = true;
+  const actual = h(20);
+  const expected = 41;
 
   assert.same(actual, expected, msg);
   assert.end();