nothing

solutions/day-03/index.js

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+// index.js
+// to import the doSomeMath from the math.js with or without extension
+import doSomeMath from './math.js'
+
+// to import the other modules
+// since these modules were not exported as default we have to desctructure
+import { addTwo, multiply, subtract } from './math.js'
+
+import * as everything from './math.js' // to import everything remaining
+console.log(addTwo(5, 5))
+console.log(doSomeMath.addTwo(5, 5))
+console.log(everything)

solutions/day-03/math.js

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+// math.js
+export const addTwo = (a, b) => a + b
+export const multiply = (a, b) => a * b
+export const subtract = (a, b) => a - b
+
+export default (function doSomeMath() {
+  return {
+    addTwo,
+    multiply,
+    subtract,
+  }
+})()