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987 B

Is

Instructions

Add new function properties to the object `is`` to check a value type

  • is.num value is a number
  • is.nan value is NaN
  • is.str value is a string
  • is.bool value is a boolean
  • is.undef value is undefined
  • is.def value is defined
  • is.arr value is an array
  • is.obj value is a simple object or null objects
  • is.fun value is a function
  • is.truthy value is truthy
  • is.falsy value is falsy

Notions

Code provided

const is = {}