Checking for type

Especially true for the special case, typeof operator combined with an if statement and a comparison operator will either allow a function to run outside of its designated context (i.e. for debugging purposes) or introduce branching logic depending on whether the object is present or not.

One can control how strict the check should be:

• lax ("not undefined"): if(typeof myVar !== "undefined") { //do something; }
• strict ("proper objects only"): if(typeof myVar === "object" && myVar) { //do stuff }