Explain typeof operator in Javascript with example

This post first appeared on hackinbits.com

The typeof operator helps in finding the type of value that your variable is storing. It returns a string indicating the type of argument. It supports two syntaxes:

1. As an operator: typeof v.
2. As a function: typeof (v).

Example:

var exp = typeof "Welcome to hackinbits.com";

//output: "string".
console.log(exp)

You can also use typeof operator to check whether a value is undefined or not.

let testVar = undefined;
var typeVar = typeof testVar;

//output: "undefined".
console.log(typeVar)

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• Javascript Data Types Explained