how to check truthy javascript code example

Example 1: js convert truthy

!!"" // false
!!0 // false
!!null // false
!!undefined // false
!!NaN // false

!!"hello" // true
!!1 // true
!!{} // true
!![] // true

Example 2: javascript truthy

// Truthy values:

// All values are truthy, BUT (excluding) the following:
0
''
undefined
null
NaN