js type checking code example

Example 1: javascript typeof shows object

What value it has 	 			What the output shows you 
 						when you write |console.log(typeof(variable);
Undefined:						"undefined"
Null:							"object"
Boolean:						"boolean"
Number:							"number"
String:							"string"
Function object:				"function"
E4X XML object:					"xml"
E4X XMLList object:				"xml"
NodeList						"Nodelist [more data]"
HTMLCollection					"HTMLCollection(1) [more data]"

Example 2: check type javascript

console.log(typeof "how are you?")
"string"
console.log(typeof false) / console.log(typeof true)
"boolean"
console.log(typeof 100)
"number"

Example 3: node js check type of variable

if (typeof i != "number") {
    console.log('This is not number');
}

Example 4: check data type in javascript

typeof("string"); //string
typeof(123); //number

Example 5: check data type in js

var x = "Hello World";
typeof x; // "string"