Chapter 0

• "Keeping programs under control is the main problem of programming. When a program works, it is beautiful. The art of programming is the skill of controlling complexity"
• "A sense of what a good program looks like is developed in practice, not learned from a list of rules."
• JavaScript ES6 came out in 2015 and since then there's been small changes each year
• This book uses JS 2017
• "As soon as you no longer use a value, it will dissipate, leaving behind its bits to be recycled as building material for the next generation of values."

Chapter 1: Numbers, Types, and Operators

Numbers

• JS uses 64 bit numbers
• Fractional numbers cannot be represented exactly with 64 bit numbers, occasionally causes problems in specific situations
• Special number values: Infinity, -Infinity, and NaN

Strings

• escape characters using \ (used for quotes, \n, and \t)
  • if you truly want a backslash, use two in a row
• JavaScript uses the Unicode standard (110k characters represented by nums) to represent strings
  • Unicode assigns every single letter, greek letter, emoji to a number, which can always be represented with bits
• Can use template literals to embed things inside strings and + to concatenate strings

let name = 'hassan'
let hello = `what's up ${name}`

Operators

• Boolean operations: true and false
  • 0, "", and NaN are false. Everything else is true. Sometimes null and undefined can be converted to false like in &&
• Logical operators: &&, ||, !, and ?
  • The || operator will return the value to its left when that can be converted to true and will return the value on its right otherwise
  • && works the exact opposite, when the value to its left is something that converts to false, it returns that value, and otherwise it returns the value on its right.
• Empty values: null and undefined