fix: describe how to use in readme

README.md

@@ -19,6 +19,26 @@ npm install --save arguments-as-string
 
 ## Use
 
+Whenever you want to serialize all arguments for a function
+
+```js
+const a2s = require('arguments-as-string')
+function main() {
+  // in "normal" function you have arguments
+  console.log(a2s(...arguments))
+}
+const foo = (...args) => {
+  // in fat arrow functional expressions you
+  // don't have "arguments", so you need to grab arguments
+  // right away
+  console.log(a2s(...args))
+}
+main(1, 'foo', 2)
+// "1 foo 2"
+foo('foo', 'bar', 33)
+// "foo bar 33"
+```
+
 ### Small print
 
 Author: Gleb Bahmutov <gleb.bahmutov@gmail.com> © 2018

__tests__/__snapshots__/arguments-as-string-spec.js.snap

@@ -21,3 +21,15 @@ exports[`arguments-as-string handles circular references 1`] = `
 `;
 
 exports[`arguments-as-string handles numbers 1`] = `"1 2 3 4 5 6"`;
+
+exports[`arguments-as-string works with fat arrows 1`] = `
+"42 foo {
+  \\"name\\": \\"bar\\"
+}"
+`;
+
+exports[`arguments-as-string works with functions 1`] = `
+"42 foo {
+  \\"name\\": \\"bar\\"
+}"
+`;

__tests__/arguments-as-string-spec.js

@@ -43,4 +43,24 @@ describe('arguments-as-string', () => {
     const result = argumentsAsString(1, 2, 3, 4, 5, 6)
     expect(result).toMatchSnapshot()
   })
+
+  it('works with functions', () => {
+    // in "normal" function you have arguments
+    function main() {
+      return argumentsAsString(...arguments)
+    }
+    const result = main(42, 'foo', {name: 'bar'})
+    expect(result).toMatchSnapshot()
+  })
+
+  it('works with fat arrows', () => {
+    // in fat arrow functional expressions you
+    // don't have "arguments", so you need to grab arguments
+    // right away
+    const main = (...args) => {
+      return argumentsAsString(...args)
+    }
+    const result = main(42, 'foo', {name: 'bar'})
+    expect(result).toMatchSnapshot()
+  })
 })