Lecture 16 Quiz: Arrow Functions & Callbacks

Note

Review before quiz: Lectures | Week 4 Content | Lab 4 | Assignment 2

Lecture 16 Self-Check

Question 1: Which option is valid arrow function syntax?

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A. const f = (x) => x * 2;

B. const f => x * 2;

C. function => (x) x*2;

D. const f = > (x) x*2;

Question 2: A callback is:

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A. Function called only by browser

B. Function passed to another function

C. Function that returns object

D. Function without parameters

Question 3: Which array methods commonly accept callback functions?

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A. map

B. filter

C. reduce

D. All of these

Question 4: Which statement about map is correct?

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A. forEach returns transformed array

B. map returns transformed array

C. map always mutates original array

D. filter returns a number

Question 5: Which is a good practice when using callbacks?

Select an item

A. Use arrow functions for every possible case

B. Avoid callbacks entirely

C. Keep callbacks small and readable

D. Never use array methods