Javascript | Check If Variable Is Set

Hello You ...

Hope you were able to deal with that car trouble from last week. Aaannyywhoo ... Let's nerd up!

A developer will frequently have to check if a variable is set. This little write up dives a bit into that.

Some server side scripting languages like PHP already have methods to do this for us. But Javascipt does not ...

So we have to find a way to check if a variable is set.

This is how:

<script>
    if (typeof var === undefined || var === null) {
        // var is not set
    }
</script>

"We have to ensure that a variable is both undefined and null"

The Village Geek

We have to ensure that a variable is both undefined and null


Cape Town, South Africa

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