PRACTICE_ARENA

Sum of Two Numbers

Write a function that takes two numbers and returns their sum.

Return Hello World

Write a function that returns the string "Hello World".

Is Even?

Write a function that returns true if a number is even, false otherwise.

Convert Minutes to Seconds

Write a function that takes an integer minutes and converts it to seconds.

Find the Largest Number

Write a function that takes an array of numbers and returns the largest number.

Reverse a String

Write a function that reverses a string.

Check for Palindrome

Write a function that checks if a string is a palindrome.

Factorial of a Number

Write a function that returns the factorial of a number.

Count Vowels

Write a function that counts the number of vowels in a string.

Remove Duplicates from Array

Write a function that removes duplicate values from an array.

Flatten Array

Write a function that flattens a nested array (one level deep).

Anagram Check

Check if two strings are anagrams of each other.

FizzBuzz

Return an array from 1 to n. Replace multiples of 3 with "Fizz", 5 with "Buzz", both with "FizzBuzz".

Fibonacci Sequence

Return the nth number in the Fibonacci sequence.

Title Case a Sentence

Capitalize the first letter of each word in a sentence.

Find Longest Word

Return the length of the longest word in a sentence.

Array Chunking

Split an array into groups the length of size.

Confirm the Ending

Check if a string ends with the given target string.

Repeat a String

Repeat a given string str (first argument) for num times (second argument).

Truncate a String

Truncate a string if it is longer than the given maximum string length.

Find Element in Array

Create a function that looks through an array arr and returns the first element in it that passes a "truth test".

Boo who

Check if a value is classified as a boolean primitive.

Mutations

Return true if the string in the first element of the array contains all of the letters of the string in the second element of the array.

Chunky Monkey

Write a function that splits an array (first argument) into groups the length of size (second argument) and returns them as a two-dimensional array.

Where do I Belong

Return the lowest index at which a value (second argument) should be inserted into an array (first argument) once it has been sorted.

Sum All Numbers in a Range

We'll pass you an array of two numbers. Return the sum of those two numbers plus the sum of all the numbers between them.

Diff Two Arrays

Compare two arrays and return a new array with any items only found in one of the two given arrays, but not both.

Seek and Destroy

You will be provided with an initial array (the first argument in the destroyer function), followed by one or more arguments. Remove all elements from the initial array that are of the same value as these arguments.

Wherefore art thou

Make a function that looks through an array of objects (first argument) and returns an array of all objects that have matching name and value pairs (second argument).

Spinal Tap Case

Convert a string to spinal case. Spinal case is all-lowercase-words-joined-by-dashes.

Pig Latin

Translate the provided string to Pig Latin.

Search and Replace

Perform a search and replace on the sentence using the arguments provided and return the new sentence.

DNA Pairing

The DNA strand is missing the pairing element. Take each character, get its pair, and return the results as a 2d array.

Missing letters

Find the missing letter in the passed letter range and return it.

Sorted Union

Write a function that takes two or more arrays and returns a new array of unique values in the order of the original provided arrays.

Convert HTML Entities

Convert the characters &, <, >, " (double quote), and ' (apostrophe), in a string to their corresponding HTML entities.

Sum All Odd Fibonacci Numbers

Given a positive integer num, return the sum of all odd Fibonacci numbers that are less than or equal to num.

Sum All Primes

Sum all the prime numbers up to and including the provided number.

Smallest Common Multiple

Find the smallest common multiple of the provided parameters that can be evenly divided by both, as well as by all sequential numbers in the range between these parameters.

Drop it

Given the array arr, iterate through and remove each element starting from the first element (the 0 index) until the function func returns true when the iterated element is passed through it.

Steamroller

Flatten a nested array. You must account for varying levels of nesting.

Binary Agents

Return an English translated sentence of the passed binary string.

Everything Be True

Check if the predicate (second argument) is truthy on all elements of a collection (first argument).

Arguments Optional

Create a function that sums two arguments together. If only one argument is provided, then return a function that expects one argument and returns the sum.

Make a Person

Fill in the object constructor with the following methods below: getFirstName(), getLastName(), getFullName(), setFirstName(first), setLastName(last), setFullName(firstAndLast).

Map the Debris

Return a new array that transforms the elements' average altitude into their orbital periods (in seconds).

Palindrome Checker

Return true if the given string is a palindrome. Otherwise, return false.

Roman Numeral Converter

Convert the given number into a roman numeral.

Caesars Cipher

Write a function which takes a ROT13 encoded string as input and returns a decoded string.

Telephone Number Validator

Return true if the passed string looks like a valid US phone number.