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public/subjects/collections/README.md

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Collections

Instructions

Write a bunch of function to move from one type to another

  • arrToSet from Array to Set
  • arrToStr from Array to String
  • setToArr from Set to Array
  • setToStr from Set to String
  • strToArr from String to Array
  • strToSet from String to Set
  • mapToObj from Map to Object
  • objToArr from Object to Array
  • objToMap from Object to Map
  • arrToObj from Array to Object
  • strToObj from String to Object

and finally write a function superTypeOf that unlike typeof return a different value for advanced types like Map and Set

Examples

const str = 'hello'
const arr = [1, 2, 1, 3]
const obj = { x: 45, y: 75, radius: 24 }
const set = new Set()
const map = new Map()
set.add(1)
set.add(2)
set.add(1)
set.add(3)
map.set('a', 1)
map.set('b', 2)
map.set(3, 'c')
map.set(4, 'd')

arrToSet(arr) // -> Set { 1, 2, 3 }
arrToStr(arr) // -> '1213'
setToArr(set) // -> [1, 2, 3]
setToStr(set) // -> '123'
strToArr(str) // -> ['h', 'e', 'l', 'l', 'o']
strToSet(str) // -> Set { 'h', 'e', 'l', 'o' }
mapToObj(map) // -> { a: 1, b: 2, '3': 'c', '4': 'd' }
objToArr(obj) // -> [45, 75, 24]
objToMap(obj) // -> Map { 'x' => 45, 'y' => 75, 'radius' => 24 }
arrToObj(arr) // -> { '0': 1, '1': 2, '2': 1, '3': 3 }
strToObj(str) // -> { '0': 'h', '1': 'e', '2': 'l', '3': 'l', '4': 'o' }

superTypeOf(map) //         -> 'Map'
superTypeOf(set) //         -> 'Set'
superTypeOf(obj) //         -> 'Object'
superTypeOf(str) //         -> 'String'
superTypeOf(666) //         -> 'Number'
superTypeOf(NaN) //         -> 'Number'
superTypeOf(arr) //         -> 'Array'
superTypeOf(null) //        -> 'null'
superTypeOf(undefined) //   -> 'undefined'
superTypeOf(superTypeOf) // -> 'Function'

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