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CSD 3313 ES6+ ES6 Quiz

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Questions and Answers

What is ES6?

A software for transpiling ES5 code

A programming language unrelated to JavaScript

The 6th version of ECMA Script programming language (correct)

A new web browser released in 2015

When was ECMAScript 2015 published?

2016

2015 (correct)

2011

2020

What is a major enhancement brought by ES6 to JavaScript?

Integration with C++ syntax

Advanced AI capabilities

Ability to run on all browsers without any issues

Easier large-scale software development (correct)

What does block scope refer to in JavaScript?

The concept of variable visibility within a block of code Signup and view all the answers

Why might a developer from Java find JavaScript's scope behavior confusing?

JavaScript only has global and function scopes Signup and view all the answers

How can ES6 code be made compatible with browsers that do not fully support it?

By converting ES6 code to ES5 using a transpiler Signup and view all the answers

What is the behavior of variable scoping in ES5 JavaScript?

Global scope and function scope only Signup and view all the answers

In ES6+, where are variables declared inside a block visible?

Inside the block and any nested blocks inside that block Signup and view all the answers

What is a common workaround to address the lack of block-level scope in JavaScript?

Immediately Invoked Function Expression (IIFE) Signup and view all the answers

Where does a variable declared using `var` exist in ES5 JavaScript?

Global scope Signup and view all the answers

What would be the output of the following code snippet in ES5 JavaScript? console.log(a); var a = 'global';

ReferenceError: a is not defined Signup and view all the answers

What is one misconception that developers from Java or C++ backgrounds might have when dealing with variable scoping in JavaScript?

Variables cannot be used outside of the block they are declared in Signup and view all the answers