CODEWITHSUNDEEP
javascript
Pyrus
Pyrus

Reputation: 95

Define variable and check if it's null at once in Javascript

Is it possible simplify this

var element = document.getElementById('myElement');
if(element)
  element.addEventListener('click', (e) => { ... });

into something like this?

if(var element = document.getElementById('myElement'))
  element.addEventListener('click', (e) => { ... });

Thank you.

Upvotes: 1

Views: 54

Answers (1)

Unmitigated
Unmitigated

Reputation: 89432

You can use optional chaining.

The ?. operator is like the . chaining operator, except that instead of causing an error if a reference is nullish (null or undefined), the expression short-circuits with a return value of undefined.

document.getElementById('myElement')?.addEventListener('click', (e) => { ... });

Upvotes: 5

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