How to check data type in javascript

Question: How to check data type in javascript

Answer:

All data type variables.

var booleanData = true; var intData = 95; var floatData = 1.55; var stringData = "String Data"; var symbolData = Symbol('Symbol Data Type'); var undefinedData; var objectData = {}; //object var newStringData = new String( "String Data using new keyword" ); //Object 

checking data type with 'typeof' javascript operator.

console.log(typeof booleanData); console.log(typeof intData); console.log(typeof floatData); console.log(typeof stringData); console.log(typeof symbolData); console.log(typeof undefinedData); console.log(typeof objectData); console.log(typeof newStringData); 

Output:

 boolean number number string symbol undefined object object 

null: JavaScript gave us "object" as the type for null, which is not correct.

var nullData = null; console.log(typeof nullData); 

output:

object 

We will use equality operator (==) or strict equality operator (===) to check null variable.

console.log(nullData == null); console.log(nullData === null); 

output:

true true 

We try to provide you the best content, if there is any mistake in this article or there is any mistake in code, then let us know.