PRESSPHP | TUTORIAL | Javascript | Check If Variable Is Set

Javascript | Check If Variable Is Set

Apr 11, 2019 The Village Geek AngularJs, Introduction, Javascript, JQuery, NodeJs, ReactJs Comment(s)

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