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Basic JavaScript Practice

Goal

The goal of Basic JavaScript Practice is to ensure you are able to use the JavaScript programming language to solve challenges on your own and are able to use constructs like:

  • Function definitions
  • Mathematical functions
  • Return functions
  • Loops
  • Objects
  • Runtime Complexity

To self-assess understanding of concepts.

Motivation

Practicing your newfound skills will solidify them for you. Completing exercises, writing out code a few extra times, and discussing it with others will help strengthen your understanding of functions, loops, objects and runtime complexity.

Directions

  • Complete each Challenge in a separate repl.it or codepen.io project, and save the links all together in a document so you and your mentor can access them easily later.
  • Before next week begins, weaker concepts should be reviewed, discussed with peers, and if there is still confusion, discuss with your mentor.

Challenges

[Challenge 1] - Convert Inches to Meters

Define a function called metersToInches that takes an input of the number of meters and outputs the result of the number of inches.

Hint: 1 meter equals 39.3701 inches.

Results

input value
metersToInches(0) 0
metersToInches(1) 39.3701
metersToInches(1.5) 59.05515
metersToInches(15.6) 614.17356

[Challenge 2] - Loop n Times

Write a function named loopThrough that takes an argument that is a number and loops through and displays a message “Hello World” that number of times.

Results

input value
loopThrough(0) Nothing displayed
loopThrough(1) Message displayed 1 time
loopThrough(3) Message displayed 3 times

[Challenge 3] - Number sum

Define a function called calculateSum to calculate the sum all the digits from 0 to an input number.

input value
calculateSum(0) 0
calculateSum(1) 1
calculateSum(3) 6
calculateSum(10) 55

[Challenge 4] - FizzBuzz

Write a function called fizzbuzz that prints each number from 1 to the input on a new line.

  • For each multiple of 3, print "Fizz" instead of the number.
  • For each multiple of 5, print "Buzz" instead of the number.
  • For numbers which are multiples of both 3 and 5, print "FizzBuzz" instead of the number.

Results

fizzbuzz(0)

Will result in the following (no) output:



fizzbuzz(16)

Will result in the following output

1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
FizzBuzz
16

[Challenge 5] Calculate Factorial Number

A factorial number is the concept in math by value of multiplying numbers by each consecutively smaller number.

For example, the value of 3 factorial, is 6, which can be calculated by:

3 * 2 * 1

The value of 10 factorial, for example, can be calculated by:

10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1

[Challenge 6] Switch Statements

Using a switch statement, write a function called sleep_in(weekday, vacation) with these criteria: The parameter weekday is True if it is a weekday, and the parameter vacation is True if we are on vacation. We sleep in if it is not a weekday or we're on vacation. Return True if we sleep in.

Results

sleep_in(false, false) → true

sleep_in(true, false) → false

sleep_in(false, true) → true

[Challenge 7] Accessing Arrays

Write a function called common(a, b) with these criteria: Given 2 arrays of ints, a and b, return True if they have the same first element or they have the same last element. Both arrays will be length 1 or more.

Results

common([1, 2, 3], [7, 3]) → True

common([1, 2, 3], [7, 3, 2]) → False

common([1, 2, 3], [1, 3]) → True

[Challenge 8] Object Keys and Values

  1. Create an object with two key-value pairs.

  2. Log that object to the console.

  3. Delete the first key-value pair in the object.

  4. Log that object to the console again. The first key-value pair should be gone.

[Challenge 9] Mutating Objects

  1. Create an array of objects with at least 2 key value pairs. The objects should all have the same keys, and the array should contain at least 3 objects.

  2. Create a function that accepts the array of objects as an argument.

  3. Print the value of the second key in each object to the console. Use dot-notation to access the values.

  4. After printing the values in step 3, change the values of the second key in every object to something new.

  5. Prove the change worked by printing the second key in each object to the console, which should show the new value. Use bracket-notation to access the values this time.

[Challenge 10] Determine Runtime Complexity

At the top your document for each challenge, state the runtime complexity for that function.

Check for Understanding

  • Demonstrate how to create a function in JavaScript.

  • Create 3 examples using Math().

  • How does a function return output?

  • Demonstrate how to write a loop.

  • Create an example object.