Answers for "type check in javascript"

javascript how to know type of variable

var foo = "Hello";
console.log(typeof foo); // string

check type javascript

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

check data type in js

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

type of javascript

//typeof() will return the type of value in its parameters.
//some examples of types: undefined, NaN, number, string, object, array

//example of a practical usage
if (typeof(value) !== "undefined") {//also, make sure that the type name is a string
  	//execute code
}

check data type in js

typeof("iAmAString");//This should return 'string'
//NO camelCase, as it is a JS Keyword

javascript type checking

var trueTypeOf = function (obj) {
	return Object.prototype.toString.call(obj).slice(8, -1).toLowerCase();
};

// Returns "array"
trueTypeOf([]);

// Returns "date"
trueTypeOf(new Date());