Basic Algorithm

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This learning module is built for new developers or those who want to practice basic/intermediate algorithms. Getting better with these basic to intermediate algorithms will solidify one's understanding of fundamentals and make one a stronger developer.

Intentionally, the learning module doesn't contain any advanced algorithm problems or data structure challenges as these will be presented in a separate module soon.

If you want to become a stronger developer or want to see how quickly you can solve these problems compared to the rest of the world, tackle each challenge carefully and once you're done, you'll see how other developers have approached each of the challenge and how they solved it. You'll also see how you did compared to the rest of the world.

Enjoy! If you're very new at coding and find these challenges too challenging at the moment, please try the other learning module: "For Complete Beginners" and also try Coding Dojo's algortihm app if you haven't already done so.

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1

Return Sum

Create a function sum() that returns the sum of the two numbers passed as its arguments. For example, sum(2,5) should return 7; sum(3,10) should return 13.
2

Countdown by 8

Log positive numbers starting at 2019, counting down by 8.<a data-re-name="html" href="http://test.datacompass.io/hh/admin/3349/hh_ulD65vQw3zd3kB/1580433510148#" alt="HTML" rel="html" role="button" ...
3

Fahrenheit to Celcius

Kelvin wants to convert between temperature scales. Create celciusToFahrenheit(cDegrees) that accepts a number of degrees in Celcius, and returns the equivalent temperature as expressed in Fahrenhe ...
4

Biggie Size

Given an array, write a function that changes all positive numbers in the array to “big”. Example: makeItBig([-1,3,5,-5]) returns that same array, changed to [-1,"big","big",-5].
5

Double Vision

Given array, create a function to return a new array where each value in the original has been doubled. Calling double([1,2,3]) should return [2,4,6].
6

Return Array Count Greater than Y

Given an array and a value Y, count and return the number of array values greater than Y. For example, returnArrayCountGreaterThanY( [2,3,5], 4) should return 1 as there is only one element in the ...
7

Sigma

Implement function sigma(num) that given a number, returns the sum of all positive integers up to number (inclusive). Ex.:sigma(3)=6(or1 + 2 + 3); sigma(5)=15(or1 + 2 + 3 + 4 + 5).
8

Factorial

Just the Facts, ma’am. Factorials, that is. Write a function factorial(num) that, given a number, returns the product (multiplication) of all positive integers from 1 up to number (inclusive). For ...
9

Swap Toward the Center

Given array, swap first and last, second and second-to-last, third and third-to- last, etc. Have the function return this swapped array. For example swapTwoardCenter([true,42,"Ada",2,"pizza"] ...
10

Threes and Fives

Create threesFives(n) that adds values from 1 and n (inclusive) if that value is not divisible by 3 or 5. Return the final sum. For example, threesFives(10) returns 22 as it only returns th ...
11

Fibonacci

Create a function to generate Fibonacci numbers. In this famous mathematical sequence, each number is the sum of the previous two, starting with values 0 and 1. Your function should accept one argu ...
12

sumToOne

Kaitlin sees beauty in numbers, but also believes that less is more. Implement sumToOne(num) that sums a given integer’s digits repeatedly until the sum is only one digit. Return that one-digit res ...
13

Clock Hand Angles (check)

Regardless of how hard a Dojo student works (and they should work hard), they need time now and then to unwind – like hands on a clock. Traditional clocks are increasingly uncommon, but most can st ...
14

Is Prime

Return whether a given integer is prime. Prime numbers are only evenly divisible by themselves and 1. Many highly optimized solutions exist, but for now just create one that is easy to understand a ...
15

Extract-o-matic

Create the extractDigit(num,digitNum) function that given a number and a digit number, returns the numeral value of that digit. 0 represents the ones digit, 1 represents the tens digit, etc. Given ...
16

Array: Reverse

Given a numerical array, reverse the order of values, in-place. The reversed array should have the same length, with existing elements moved to other indices so that order of elements is reversed. ...
17

Filter Range

Alan is good at breaking secret codes. One method is to eliminate values that lie within a specific known range. Given arr and values min and max, retain only the array values between min and max. ...
18

Array: Concat

Replicate JavaScript’s concat(). Create a standalone function that accepts two arrays. Return a new array containing the first array’s elements, followed by the second array’s elements. Do not alte ...
19

Skyline Heights

Lovely Burbank has a breathtaking view of the Los Angeles skyline. Let’s say you are given an array with heights of consecutive buildings, starting closest to you and extending away. Array [-1,7,3] ...
20

Array: Second-to-Last

Return the second-to-last element of an array. Given [42,true,4,"Kate",7], return "Kate". If array is too short, return null.
21

Array: Nth-to-Last

Return the element that is N-from-array’s-end. Given ([5,2,3,6,4,9,7],3), return 4. If the array is too short, return null.
22

Array: Remove Range

Given array, and indices start and end, remove vals in that index range, working in-place (hence shortening the array). Given ([20,30,40,50,60,70],2,4), change to [20,30,70] and return it.
23

Credit Card Validation

The Luhn formula is sometimes used to validate credit card numbers. Create the function isCreditCardValid(digitArr) that accepts an array of digits on the card (13-19 depending on the card), and re ...
24

Zip it

Create a standalone function that accepts two arrays and combines their values sequentially into a new array, at alternating indices starting with first array. Extra values from either arr ...
25

Parens Valid

Create a function that, given an input string str, returns a boolean whether parentheses in str are valid. Valid sets of parentheses always open before they close, ...
26

Bubble Sort

Understanding how to implement basic sorting algorithm is a good exercise. For this particular challenge, you are to implement bubble sort. The animation below demonstrates how bubble sort ...
27

Multiple Table

Create a function that prints a multiplication table such as follows: multiTable(2,2) should print 1 2 2 4 multiTable(3,3) should print 1 2 3 < ...
28

Two Dimensional Array Part I

Create a function that returns a two dimensional array containing bunch of zeros. For example twoDimensional(2,5) should return a following array: [ [ 0, 0, 0, 0, 0], [ 0, 0 ...
29

Two Dimensional Array Part II

Create a function twoDimensional(row, column) that returns a two dimensional array containing bunch of zeros but where the outer values are filled with ones. For example twoDimensional(5,5) should ...

Return Sum

Countdown by 8

Fahrenheit to Celcius

Biggie Size

Double Vision

Return Array Count Greater than Y

Sigma

Factorial

Swap Toward the Center

Threes and Fives

Fibonacci

sumToOne

Clock Hand Angles (check)

Is Prime

Extract-o-matic

Array: Reverse

Filter Range

Array: Concat

Skyline Heights

Array: Second-to-Last

Array: Nth-to-Last

Array: Remove Range

Credit Card Validation

Zip it

Parens Valid

Bubble Sort

Multiple Table

Two Dimensional Array Part I

Two Dimensional Array Part II