variable is undefined javascript code example

Example 1: javascript check for undefined

if (typeof myVariable === 'undefined'){
    //myVariable is undefined
}

Example 2: javascript typeof undfined

var x;
if (typeof x === 'undefined') {
   // these statements execute
}

Example 3: Undefined variable

@extends('layouts.app') @section('content') <h1>{{$post->title}}</h1> <p>{{$test}}</p>  @endsection