how to check the variable is undefined in javascript code example

Example 1: javascript check undefined

if(myVar === null) {
	console.log("Element is undefined");
}

Example 2: javascript check if undefined or null

// simple check do the job
if (myVar) {
 // comes here either myVar is not null,
 // or myVar is not undefined,
 // or myVar is not '' (empty string).
}