Completed.

data-and-functions-1/src/functions/getActiveUsers.js

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+import DATA from '../DATA.js'
+
+const getActiveUsers = (dataIn) => {
+  if(!dataIn || !dataIn.users){
+    return null
+  }
+  return dataIn.users.filter((user) => user.accountActive)
+}
+
+export default getActiveUsers

data-and-functions-1/src/functions/getMostExpensiveProduct.js

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+import DATA from '../DATA.js'
+
+const getMostExpensiveProduct = (dataIn) => {
+  if(!dataIn || !dataIn.products){
+    return null
+  }
+  return dataIn.products.reduce((maxVal, product) => (product.price > maxVal.price) ? product : maxVal ,dataIn.products[0])
+}
+
+export default getMostExpensiveProduct

data-and-functions-1/src/functions/getOrderInfo.js

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+import DATA from '../DATA.js'
+
+const getOrderInfo = (dataIn) => {
+  if(!dataIn || !dataIn.orders){
+    return null
+  }
+  return dataIn.orders.map((order) => {
+    const orderInfo = {}
+    dataIn.users.forEach((user) => {
+      if(user.id === order.userId){
+        orderInfo.userName = user.name
+        orderInfo.orderId = order.id
+      }
+    })
+
+    dataIn.products.forEach((product) => {
+      if(product.id === order.productId){
+        orderInfo.price = product.price
+      }
+    })
+
+    return orderInfo
+  })
+}
+
+export default getOrderInfo

data-and-functions-1/src/functions/getProductById.js

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+import DATA from '../DATA.js'
+
+const getProductById = (dataIn, id) => {
+  if(!dataIn || !id || !dataIn.products){
+    return null
+  }
+  return dataIn.products.find((product) => product.id === id)
+}
+
+export default getProductById

data-and-functions-1/src/functions/getUserById.js

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+import DATA from '../DATA.js'
+
+const getUserById = (dataIn, user_id) => {
+  if(!dataIn || !dataIn.users || !user_id){
+    return null
+  }
+  return dataIn.users.find((user) => user.id === user_id)
+}
+
+export default getUserById

data-and-functions-2/src/functions/getProductsForOrder.js

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+import DATA from '../DATA'
+
+const getProductsForOrder = (dataIn,orderId) => {
+  if(!dataIn || !dataIn.orders || !orderId){
+    const err = new Error("Error")
+    throw err
+  }
+
+  let lookupOrder = {}
+  dataIn.orders.forEach((order)=> lookupOrder[order.id] = order)
+
+  if(!lookupOrder[orderId]) return null
+
+  let productLookup = {}
+  dataIn.products.forEach((product) => productLookup[product.id] = product)
+
+  return lookupOrder[orderId].products.map((productId) => productLookup[productId])
+}
+
+export default getProductsForOrder

data-and-functions-2/src/functions/getTotalPriceForOrder.js

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+import DATA from '../DATA'
+
+const getTotalPriceForOrder = (dataIn, orderId) => {
+  if(!dataIn || !dataIn.orders || !orderId){
+    const err = new Error("Error")
+    throw err
+  }
+
+  let lookupOrder = {}
+  dataIn.orders.forEach((order) => lookupOrder[order.id] = order)
+
+  if(!lookupOrder[orderId]) return null
+
+  let lookupProduct = {}
+  dataIn.products.forEach((product) => lookupProduct[product.id] = product)
+
+  return lookupOrder[orderId].products.reduce((sum, productId) => sum + lookupProduct[productId].price,0)
+}
+
+export default getTotalPriceForOrder

data-and-functions-3/src/functions/addOrder.js

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+import DATA from '../DATA'
+
+const addOrder = (dataIn, newOrder) => {
+  if(!dataIn || !dataIn.orders || !newOrder){
+    const err = new Error("Missing data")
+    throw err
+  }
+
+  if(typeof newOrder !== "object" || !(newOrder.userId && newOrder.products) || newOrder.id){
+    const err = new Error("Wrong data-type or wrong format")
+    throw err
+  }
+
+  const usersLookup = {}
+  dataIn.users.forEach((user) => usersLookup[user.id] = user)
+
+  if(!usersLookup[newOrder.userId]){
+    const err = new Error("User invalid/not found")
+    throw err
+  }
+
+  const productsLookup = {}
+  dataIn.products.forEach((product) => productsLookup[product.id] = product)
+
+  newOrder.products.forEach((productId) =>{
+    if(!productsLookup[productId]){
+      const err = new Error("Invalid product id")
+      throw err
+    }
+  })
+
+  newOrder.id = dataIn.orders[dataIn.orders.length-1].id + 1
+  dataIn.orders.push(newOrder)
+  return newOrder
+}
+
+export default addOrder

data-and-functions-3/src/functions/addProduct.js

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+import DATA from '../DATA'
+
+const addProduct = (dataIn, newProduct) => {
+  if(!dataIn || !dataIn.products || !newProduct){
+    const err = new Error("Invalid inputs/missing")
+    throw err
+  }
+
+  if(typeof newProduct !== "object" || !(newProduct.price && newProduct.name) || newProduct.id){
+    const err = new Error("Invalid data-type or format.")
+    throw err
+  }
+
+  newProduct.id = dataIn.products[dataIn.products.length-1].id + 1
+  dataIn.products.push(newProduct)
+  return newProduct
+}
+
+export default addProduct