Exercises
Strengthen your JavaScript ES6 knowledge with this fundamentals quiz. Answer questions covering concise object syntax, let variables, arrow functions, array mapping, destructuring, default parameters, Set collections, template literals, promise error handling, and generators. Whether you are learning modern JavaScript or reviewing core ECMAScript 2015 features, this quiz helps you check your understanding of the syntax and tools used in contemporary web development.
Answer the questions below and check the explanation for each answer.
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ES6 introduced Object Literal Enhancements, allowing properties to be defined without specifying key-value pairs when the variable names are the same.
The let keyword was introduced in ES6 and allows for the reassignment of variables, while const is used for constant values that cannot be reassigned.
The code uses an arrow function to add 1 to each element, resulting in the array [2, 3, 4].
Destructuring is a feature in ES6 that allows for the unpacking of arrays or objects, enabling the extraction of values into distinct variables using clean syntax.
Arrow functions use lexical scoping, meaning they inherit this from the surrounding code, reducing common errors with this in callbacks.
In ES6, you can declare default parameters directly in the function signature by providing a default value next to the parameter, as shown in function(a, b = 1).
The Set data structure in ES6 allows storing unique values of any type, and automatically removes duplicate values.
Template literals in ES6 are denoted using backticks (`). They allow for multi-line strings and embedded expressions.
The .catch() method is used in promise chains to capture errors and handle them appropriately.
Generators are functions that can pause their execution using yield and resume later from the point they were paused.
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