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The JavaScript Interview Handbook: 100+ Interview Questions

Challenge: Instance of Array?

Explore how to manipulate prototypes in JavaScript to make an object pass the instanceof Array test. This lesson helps you deepen your understanding of inheritance and type checking in JavaScript with hands-on practice.

We'll cover the following...

Problem statement

Take a look at the code below:

Javascript (babel-node)
function check(){
    var tempFunc = function () {}
    
    return new tempFunc instanceof Array; 
}
console.log(check())

The check ...