MicFin

PROGRAMMING INSPIRATION

• The Myth of the Real Javascript Developer (junior to intermediate)
• Javascript Masterclass (intermediate to expert)
• The Myth of the Genius Programmer
• Making Badass Developers
• Evolution of a Developer
• Writing Software by David Heinemeier Hansson (creator of RoR)
• “Am I Senior Yet?” Grow Your Career by Teaching Your Peers
• Being Human
• What can programmers learn from pilots?

MicFin

How many pages have I torn out?

Last month I borrowed a plenty of books from the library. They all were good books, packed with emotions and plot-twists. Unfortunately, at some points I got very angry/sad/disappointed, so I tore some pages out.

Now the library wants to know how many pages I have torn out for each book.

Your goal is to write a program, which takes a sorted, comma-delimited list of numbers as input and prints the minimum and maximum possible page count I could have torn out. Each line represents a book, each number represents a missing page from the book.

Example input:

MicFin

'use strict'

// Check if every one of the countries have launched 20 or more rockets
// using a predicate function
const rockets = [
    { country: 'Russia', launches: 32 },
    { country: 'US', launches: 23 },
    { country: 'China', launches: 16 },
    { country: 'Europe(ESA)', launches: 7 },
    { country: 'India', launches: 4 },

MicFin

'use strict'

// Check if some of the countries have launched 20 or more rockets
// using a predicate function called isAggressive
const rockets = [
    { country: 'Russia', launches: 32 },
    { country: 'US', launches: 23 },
    { country: 'China', launches: 16 },
    { country: 'Europe(ESA)', launches: 7 },
    { country: 'India', launches: 4 },

MicFin

'use strict'

// Starting array
const ages = [7, 24, 21, 18, 22]

// Use find to return the age of first age over 21
// using a predicate function
const isAdult = (age) => {
  return age >= 21
}

MicFin

'use strict'

// Starting array
const ages = [7, 24, 21, 18, 22]

// Use indexOf to find the position of 21
ages.indexOf(21) // 2

// Use findIndex to find the position of first age over 21
// using a predicate function

MicFin

'use strict'

// Example array
const numsArray = [0, 1, 2, 3, 4]

// Filter for odd elements in an array using predicate function
const isOdd = (num) => {
  return num % 2
}
odds = numsArray.filter(isOdd)

MicFin

'use strict'
// Example array
const numsArray = [0, 1, 2, 3, 4]

// Find the sum of all elements in an array using anonymous arrow function
const sum = numsArray.reduce((prev, curr) => prev + curr)

// Find the sum of all elements in an array using named arrow function
const add = (prev, curr) => {
  return prev + curr

MicFin

• Simplicity !== Easy
• Easy is short term and can sometimes even introduce complexity
• Simplicity allows for easy while avoiding complexity
• Complect == tangling/braiding together
• Complexity is the result of something that has been complected
• Untangle complected code (e.g. decoupling of components)
• Do not chain calls (i.e. Law of Demeter)
• Consider Channels as form of asynchronous flow control
• Ask yourself all the time: "can this thing be moved? does it have well defined boundaries?"

MicFin

High Level Principles

The following principles are very 'high-level' and meant to be used as a quick reference guide, as apposed to the other standards/guideline documents which will focus on specific language idioms and design patterns.

• Iceberg Classes
• Law of Demeter
• Don't Repeat Yourself
• Design Patterns
• S.O.L.I.D