0xjoanne/Link-Apprenticeship-Exercise

This is the coding exercise for the Link Apprenticeship application in Nulogy.

Link Apprenticeship Exercise

Runtime Versions

node.js v7.7.3

npm v4.1.2

Install Package

$ npm install

Run tests

$ npm test

Documentation

Usage

const calculator = require('./calculator.js')
const result = caculator.calcCost(basePrice, personNum, category)

Params

• basePrice: Number (greater than 0)
• personNum: Integer (greater than 0)
• category: String, "food", "drugs", "electronics", "other"

if all args are valid, return {done: true, result: 40}

if invalid or missing, return {done: false, msg: 'arg missing'}

Reflection

1. Check if parameters are missing or invalid to make sure calculator works well.

2. Using category map, instead of "if else" statement, to calculate cost is more straightforward.

3. Define typeof val === 'undefined' which is called multiple times as a public function.

4. If only return false or return error message, it is not clear for caller to check error. So I decided to return done: false or done: true instead.