Check If a Variable is of Function Type in JavaScript

This tutorial shows how to check if a given variable is of function type. In JavaScript, we use typeof keyword to find the type of a given variable.

Example 1: Printing the Type

const printHello = () => {
    console.log(" Hello! ");
};
console.log("The type of printHello is: ",typeof printHello);

Output

The type of printHello is: function

Example 2: Check if the Given Variable is Function

function printHello () {
    console.log(" Hello! ")
}
if (typeof printHello == 'function') {
    console.log("The given variable is a function");
}

Output

The given variable is a function