Komoot Questions

javascript.js

/**
 * Comments on https://gist.github.com/danielgard/3ee8afe0fc2d6905f7ec82331930ec8f
 *
 * 1. Arrow functions do not have their own this or arguments object.
 * 2. Curly brackets are not needed when there is only a `return` statement
 *
 *     const doubleNumbers = () => { this.arguments.map(a => a * 2) }
 *
 * 3. A closing `)` bracket is missing
 * 4. A newline character is missing at the end of the file
 *
 *     console.log(doubleNumbers(1,2,3)
 */
const doubleNumbers = (...args) => args.map(a => a * 2)
console.log(doubleNumbers(1, 2, 3))

react.js

/**
 * Comments on https://gist.github.com/danielgard/b1dc61ca77e6bb7add749f8e4f44e665
 *
 * 1. Only user defined components should start with an upper case
 * 2. Keys should be given to the elements inside an array
 * 3. A newline character is missing at the end of the file
 *
 *     <list>{['Evan', 'Ben', 'Maria', 'Daniel'].map(name => (<Span>{name}</Span>))}</list>
 */
<ul>{['Evan', 'Ben', 'Maria', 'Daniel'].map((name, index) => (<li key={index}>{name}</li>))}</ul>