I have been using !$A.util.isEmpty(var) to check if value in empty/null/undefined in aura but this is not supported in LWC. What will be equivalent of this expression in LWC.

I don't want to write like if(this.var!==null && this.var!==undefined && this.var!=='')


This is a great question. Actually, it's more of a Javascript question than a LWC related question.

Quite simply because the answer is not related to LWC but to pure Javascript.

You just need to use the below code:


In fact, Javascript will check if the var value is not undefined, not null and not an empty string.


If we had to compare Aura to LWC in general, I would say that LWC is a real Javascript framework, a modern framework. This often involves Javascript takes a much more important place than the view, unlike Aura. But also that it is possible to use all the power of today's Javascript. And this is awesome!

  • Thanks @Martin! This is simple and elegant. – devforce Oct 30 '19 at 13:36
  • Glad I could help @devforce ! – Martin Lezer Oct 30 '19 at 13:40

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