ES6 Quiz 1

What is the correct syntax for an arrow function in JavaScript that takes two parameters `x` and `y` and returns their sum?

• `function(x, y) { return x + y; }`

• `(x, y) => { return x + y; }`

• `function x+y => { return x + y; }`

• `(x, y) => x + y`

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DOK Level 1: Recall

Which of the following is a use of template literals in JavaScript?

• To perform complex mathematical operations

• To link CSS stylesheets

• To embed expressions within string literals

• To declare functions

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DOK Level 1: Recall

What does the spread syntax in JavaScript do?

• It condenses multiple values into one array

• It spreads the elements of an iterable (like an array) into individual elements

• It encrypts data

• It creates a new function

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DOK Level 1: Recall

Which of the following best describes a Promise in JavaScript?

• A function that handles asynchronous operations

• A data structure that stores multiple values

• An object representing the eventual completion or failure of an asynchronous operation

• A template for creating multiple objects

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DOK Level 1: Recall

What is the primary purpose of the async/await syntax in JavaScript?

• To handle exceptions in synchronous code

• To make writing asynchronous code easier and more readable

• To increase the execution speed of functions

• To iterate over arrays

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DOK Level 1: Recall

How can you correctly capture the output of a Promise using async/await in JavaScript?

• `let result = await Promise;`

• `let result = async Promise;`

• `let result = await Promise();`

• `let result = Promise.await();`

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DOK Level 2: Skill/Concept

• Fifteen is 15 and not 20.

• Fifteen is 15 and not 25.

• Error

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DOK Level 2: Skill/Concept

Which option correctly uses arrow functions to filter out all odd numbers from an array?

• `let arr = [1, 2, 3, 4]; arr.filter((num) => num % 2);`

• `let arr = [1, 2, 3, 4]; arr.filter(num => num % 2 == 0);`

• `let arr = [1, 2, 3, 4]; arr.filter(num => { num % 2 });`

• `let arr = [1, 2, 3, 4]; arr.filter((num) => { num % 2 == 0 });`

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DOK Level 2: Skill/Concept

What is the result of using the spread syntax to combine the arrays `[1, 2, 3]` and `[4, 5, 6]`?

• `[1, 2, 3, [4, 5, 6]]`

• `[1, 2, 3, 4, 5, 6]`

• `[[1, 2, 3], 4, 5, 6]`

• `Syntax Error`

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DOK Level 2: Skill/Concept

How does an arrow function differ from a traditional function in JavaScript in terms of `this` context?

• Arrow functions do not have their own `this` context; they inherit it from the enclosing execution context.

• Arrow functions have their own `this` context which is bound at creation time.

• There is no difference in how `this` is handled between arrow and traditional functions.

• Arrow functions redefine `this` each time they are called.

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DOK Level 2: Skill/Concept