Is there a standard function to check for null, undefined, or blank variables in JavaScript?

Question

Is there a universal JavaScript function that checks that a variable has a value and ensures that it\'s not undefined or null? I\'ve got this code,

Answer 1

return val || 'Handle empty variable'

is a really nice and clean way to handle it in a lot of places, can also be used to assign variables

const res = val || 'default value'