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Solving "Boo who" / freeCodeCamp Algorithm Challenges

virenb profile image Viren B Updated on ・2 min read

Solving freeCodeCamp's Algorithm Challenges (37 Part Series)

1) FCC Algorithm Challenges / Convert Celsius to Fahrenheit 2) FCC Algorithm Challenges / Reverse a String 3 ... 35 3) FCC Algorithm Challenges / Factorialize a Number 4) FCC Algorithm Challenges / Find the Longest Word in a String 5) FCC Algorithm Challenges / Return Largest Numbers in Arrays 6) Solving "Confirm the Ending" / FreeCodeCamp Algorithm Challenges 7) Solving "Repeat a String Repeat a String" / FreeCodeCamp Algorithm Challenges 8) Solving "Truncate a String" / freeCodeCamp Algorithm Challenges 9) Solving "Finders Keepers" / freeCodeCamp Algorithm Challenges 10) Solving "Boo who" / freeCodeCamp Algorithm Challenges 11) Solving "Title Case a Sentence" / freeCodeCamp Algorithm Challenges 12) Solving "Slice and Splice" / freeCodeCamp Algorithm Challenges 13) Solving "Falsy Bouncer" / freeCodeCamp Algorithm Challenges 14) Solving "Where do I Belong" / freeCodeCamp Algorithm Challenges 15) Solving "Mutations" / freeCodeCamp Algorithm Challenges 16) Solving "Chunky Monkey" / freeCodeCamp Algorithm Challenges 17) Solving "Sum All Numbers in a Range" / freeCodeCamp Algorithm Challenges 18) Solving "Diff Two Arrays" / freeCodeCamp Algorithm Challenges 19) Solving "Seek and Destroy" / freeCodeCamp Algorithm Challenges 20) Solving "Wherefore art thou" / freeCodeCamp Algorithm Challenges 21) Solving "Spinal Tap Case" / freeCodeCamp Algorithm Challenges 22) Solving "Pig Latin" / freeCodeCamp Algorithm Challenges 23) Solving "Search and Replace" / freeCodeCamp Algorithm Challenges 24) Solving "DNA Pairing" / freeCodeCamp Algorithm Challenges 25) Solving "Missing letters" / freeCodeCamp Algorithm Challenges 26) Solving "Sorted Union" / freeCodeCamp Algorithm Challenges 27) Solving "Convert HTML Entities" / freeCodeCamp Algorithm Challenges 28) Solving "Sum All Odd Fibonacci Numbers" / freeCodeCamp Algorithm Challenges 29) Solving "Sum All Primes" / freeCodeCamp Algorithm Challenges 30) Solving "Smallest Common Multiple" / freeCodeCamp Algorithm Challenges 31) Solving "Drop it" / freeCodeCamp Algorithm Challenges 32) Solving "Steamroller" / freeCodeCamp Algorithm Challenges 33) Solving "Binary Agents" / freeCodeCamp Algorithm Challenges 34) Solving "Everything Be True" / freeCodeCamp Algorithm Challenges 35) Solving "Arguments Optional" / freeCodeCamp Algorithm Challenges 36) Solving "Make a Person" / freeCodeCamp Algorithm Challenges 37) Solving "Map the Debris" / freeCodeCamp Algorithm Challenges

Post can also be found on my website https://virenb.cc/fcc-010-boo-who

'Boo who' Challenge

Let's solve freeCodeCamp's Basic Algorithm Scripting Challenge, "Boo who"

Our Starter Code (& Tests)

function booWho(bool) {
  return bool;
}

booWho(null);

// Tests
booWho(true) should return true.
booWho(false) should return true.
booWho([1, 2, 3]) should return false.
booWho([].slice) should return false.
booWho({ "a": 1 }) should return false.
booWho(1) should return false.
booWho(NaN) should return false.
booWho("a") should return false.
booWho("true") should return false.
booWho("false") should return false.

Our Instructions

Check if a value is classified as a boolean primitive. Return true or false.

Boolean primitives are true and false.

Thoughts

  • The argument's data types vary. Some booleans, strings, arrays, functions, etc.
  • After reading the instructions and tests a few times, we must narrow in on true or false inputs/arguments only.
  • We have to return a boolean, true or false.

Further Thoughts

Reading the instructions again, the challenge is asking us to return true for boolean primatives.

(Looking at the tests, booWho(false) must return true.)

So, we must write a function, which returns true if the input is a true or false. If it is any other value, we must return false.

There is a built in operator in JavaScript, typeof which returns the data type.

MDN documentation: typeof

Some pseudo pseudocode:

booWho(input) {
    if input type is true or false
        return true
    else
        return false    
}

We are just checking the typeof of the argument.

Solution

[SPOILER: SOLUTION TO CODE BELOW]

function booWho(bool) {
  return typeof bool == 'boolean';
}

Links & Resources

'Boo who' Challenge on fCC

freeCodeCamp

Donate to FCC!

Solution on my GitHub

Thank you for reading!

Solving freeCodeCamp's Algorithm Challenges (37 Part Series)

1) FCC Algorithm Challenges / Convert Celsius to Fahrenheit 2) FCC Algorithm Challenges / Reverse a String 3 ... 35 3) FCC Algorithm Challenges / Factorialize a Number 4) FCC Algorithm Challenges / Find the Longest Word in a String 5) FCC Algorithm Challenges / Return Largest Numbers in Arrays 6) Solving "Confirm the Ending" / FreeCodeCamp Algorithm Challenges 7) Solving "Repeat a String Repeat a String" / FreeCodeCamp Algorithm Challenges 8) Solving "Truncate a String" / freeCodeCamp Algorithm Challenges 9) Solving "Finders Keepers" / freeCodeCamp Algorithm Challenges 10) Solving "Boo who" / freeCodeCamp Algorithm Challenges 11) Solving "Title Case a Sentence" / freeCodeCamp Algorithm Challenges 12) Solving "Slice and Splice" / freeCodeCamp Algorithm Challenges 13) Solving "Falsy Bouncer" / freeCodeCamp Algorithm Challenges 14) Solving "Where do I Belong" / freeCodeCamp Algorithm Challenges 15) Solving "Mutations" / freeCodeCamp Algorithm Challenges 16) Solving "Chunky Monkey" / freeCodeCamp Algorithm Challenges 17) Solving "Sum All Numbers in a Range" / freeCodeCamp Algorithm Challenges 18) Solving "Diff Two Arrays" / freeCodeCamp Algorithm Challenges 19) Solving "Seek and Destroy" / freeCodeCamp Algorithm Challenges 20) Solving "Wherefore art thou" / freeCodeCamp Algorithm Challenges 21) Solving "Spinal Tap Case" / freeCodeCamp Algorithm Challenges 22) Solving "Pig Latin" / freeCodeCamp Algorithm Challenges 23) Solving "Search and Replace" / freeCodeCamp Algorithm Challenges 24) Solving "DNA Pairing" / freeCodeCamp Algorithm Challenges 25) Solving "Missing letters" / freeCodeCamp Algorithm Challenges 26) Solving "Sorted Union" / freeCodeCamp Algorithm Challenges 27) Solving "Convert HTML Entities" / freeCodeCamp Algorithm Challenges 28) Solving "Sum All Odd Fibonacci Numbers" / freeCodeCamp Algorithm Challenges 29) Solving "Sum All Primes" / freeCodeCamp Algorithm Challenges 30) Solving "Smallest Common Multiple" / freeCodeCamp Algorithm Challenges 31) Solving "Drop it" / freeCodeCamp Algorithm Challenges 32) Solving "Steamroller" / freeCodeCamp Algorithm Challenges 33) Solving "Binary Agents" / freeCodeCamp Algorithm Challenges 34) Solving "Everything Be True" / freeCodeCamp Algorithm Challenges 35) Solving "Arguments Optional" / freeCodeCamp Algorithm Challenges 36) Solving "Make a Person" / freeCodeCamp Algorithm Challenges 37) Solving "Map the Debris" / freeCodeCamp Algorithm Challenges

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Viren B

@virenb

Self-taught developer, always looking to learn more.

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