API.md

ARRAY API

let array = [0,1,2,3,4,5].slice(1, 5) // [1, 2, 3, 4] : get index from 1 to 4 
let array = [0,1,2,3,4,5]
array.splice(2, 0, 'toto') // [0, 1, 'toto', 2, 3, 4] : insert 'toto' at the index 2
array.splice(2, 0, 'toto', 'tata') // [0, 1, 'toto', 'tata', 2, 3, 4] : insert 'toto' at the index 2 (so push the previous on at index 3)
array.splice(2, 2) // [0,1,4,5] delete two items starting at the index 2

array.concat(array2) // return a new array
array.reduce((accumulator, currentValue, index, array) => {}, 0)
array.find()
array.findIndex()
array.include()

function compare(a, b) {
  if (a is less than b by some ordering criterion) {
    return -1;
  }
  if (a is greater than b by the ordering criterion) {
    return 1;
  }
  // a must be equal to b
  return 0;
}
function compareNumbers(a, b) {
  return a - b;
}

MATH API

let upperLimit = Number.MAX_SAFE_INTEGER : 9007199254740991
let lowerLimit = Number.MIN_SAFE_INTEGER : -9007199254740991

32 bit max : 2**31 - 1
32 bit min : -2**31

let pi = Math.PI;
let squareRoot = Math.sqrt();
let max = Math.max(...numbers);

STRING API

ASCII table : Majuscule before minuscule

String.fromCharCode() // get the character from the char code position
'a'.charCodeAt(0) // get ghe ACII char code position
let char = ('a'.charCodeAt(0) + 'E'.charCodeAt(0) - 'A'.charCodeAt(0)) // 101 ('e') : get the code of the lower case

BOOLEAN

Boolean("test") // true

NUMBER (NaN)

let int = parseInt('11')
let float = parseFloat('11,3')

let number = parseInt('test')
isNaN(number) // true

DATE API

let dateFromString = new Date('2017-2-10T00:00:00Z')
let dateFromTimstamp = new Date(1582217025)
let dateFromParams = new Date(YEAR, MOUNT_START_AT_I_0, DAY, HOURS, MIN, SEC)

let date = new Date(...)
date.getTime() // 1582217025
date.toISOString() // "2020-02-20T16:54:06.955Z"
date.toString() // "Thu Feb 20 2020 17:54:06 GMT+0100 (Central European Standard Time)"

Construct one for each date, then compare them using the >, <, <= or >=.

The ==, !=, ===, and !== operators require you to use date.getTime() as in

SYSTEM DESIGN AND SCALABILITY

read-heavy vs write-heavy
failure
availability vs reliability
security \

Easy of use
Easy to implement
Flexible \

OPERATORs

Common operators
Division assignment	x /= y	x = x / y
Remainder assignment	x %= y	x = x % y
Exponentiation assignment	x **= y	x = x ** y

Bitwise operators
Left shift assignment	x <<= y	x = x << y
Right shift assignment	x >>= y	x = x >> y
Unsigned right shift assignment	x >>>= y	x = x >>> y
Bitwise AND assignment	x &= y	x = x & y
Bitwise XOR assignment	x ^= y	x = x ^ y
Bitwise OR assignment	x |= y	x = x