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How to find type of variable in JavaScript?

In this tutorial, let’s learn how to identify the type of a variable in JavaScript.

In short, the answer in typeof. In JavaScript, the typeof operator returns the data type of its operand in the form of a string. The operand can be any object, function, or variable. 

console.log(typeof "foo"); //string

console.log(typeof true); //boolean

console.log(typeof 17); //number

console.log(typeof undefined); //undefined

console.log(typeof justAnUndeclaredVariable); //undefined

console.log(typeof {name: "Anand"}); //object

console.log(typeof function() {} ); //function
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