Enums

Special classes representing groups of constants

Numeric enums; default

By default, enums are numeric, starting at 0, and incrementing by 1

enum Compass {
  North,
  East,
  South,
  West,
}
let currentDirection = Compass.North;

console.log(currentDirection); // North is the first value
// so it logs '0'

currentDirection = 'North'; // Error: "North" is not assignable
// to type 'Compass'.

Numeric enums done right, initialized

enum Compass2 {
  North = 1,
  East,
  South,
  West,
}

console.log(Compass2.North); // logs 1

console.log(Compass2.South); // logs 3

Initialized numeric enums fully set up

enum LeetCodes {
  E = 3,
  T = 7,
  S = 5,
  A = 4,
}

console.log(LeetCodes.E); // logs 3

console.log(LeetCodes.A); // logs 4

String enums

enum Compass3 {
  North = 'North',
  East = 'East',
  South = 'South',
  West = 'West',
}

console.log(Compass3.North); // logs "North"

console.log(Compass3.South); // logs "South"

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