Checking something isEmpty in Javascript?

Question

How can I check if a variable is empty in Javascript? Sorry for the stupid question, but I\'m a newbie in Javascript!

if(response.photo) is empty {
    do so         


        

Answer 1

function isEmpty(variable) {
  const type = typeof variable
  if (variable === null) return true
  if (type === 'undefined') return true
  if (type === 'boolean') return false
  if (type === 'string') return !variable
  if (type === 'number') return false
  if (Array.isArray(variable)) return !variable.length
  if (type === 'object') return !Object.keys(variable).length
  return !variable
}