Conditional spread element

Question

const cond = false

const extraInfo = [
  {
    a: 11,
    b: 25
  },
  {
    a: 12,
    b: 34
  },
  {
    a: 1,
    c: 99
  }
]

const userInfo = [
  {
    z: 8
  },
          


        

Answer 1

Conditionally spread an entity to Object

console.log(
  { 
    name: 'Alex',
    age: 19,
    ...(true && { city: 'Kyiv' }),
    ...(false && { country: 'Ukraine' })
  }
) 

// { name: 'Alex', age: 19, city: 'Kyiv' }

Conditionally spread an entity to Array

console.log(
  [
    'Dan',
    'Alex',
    ...(true ? ['Robin'] : [])
  ]
)

// [ 'Dan', 'Alex', 'Robin' ]