javascript object undefined check code example

Example 1: how to check if object is undefined in javascript

if (typeof something === "undefined") {
    alert("something is undefined");
}

Example 2: javascript check undefined

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

Example 3: undefined javascript check

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