Question

Recently I was working with some JavaScript code and I found this:

<script type="text/javascript">
    window.localStorage&&window.localStorage.clear();
</script>

I did research around the web but didn’t find anything about how actually that ‘&&’ operator works if isn’t in a control statement.

Does anyone know how it works?

Answer 1

That’s the same as:

if(window.localStorage){
    window.localStorage.clear();
}

The && short-circuits as soon as it sees a false (or “falsy”) value.

So, if window.localStorage is false (or “falsy”), it stops. If it’s true, it continues and runs window.localStorage.clear(). The return value is ignored.