Here's a friendly walkthrough of how challenges on Praxide work. In the Code tab above you'll find a starter function that looks like this: function returnTrue() { } All you need to do is type return true; between the curly braces { } and then click the Check button. Get it right and the button turns red, flashing SUB …

Write a function that accepts two numbers as arguments and hands back their total. Examples addition(3, 2) ➞ 5 addition(-3, -6) ➞ -9 addition(7, 3) ➞ 10 Notes Remember to return your answer. Stuck on a challenge? Find hints in the Resources tab. Really stuck? Reveal the answer in the Solutions tab.

Write a function that accepts a number as an argument, bumps that number up by +1 and returns the outcome. Examples addition(0) ➞ 1 addition(9) ➞ 10 addition(-3) ➞ -2 Notes Remember to return your answer. Stuck on a challenge? Find hints in the Resources tab. Really stuck? Unlock the answer in the So …

Build a function that accepts an integer minutes and turns it into the equivalent number of seconds. Examples convert(5) ➞ 300 convert(3) ➞ 180 convert(2) ➞ 120 Notes Remember to return your result. If a challenge stumps you, look for hints in the Resources tab. When you're truly stuck, reveal answers in the Solutions tab.

Build a function that receives the base and height of a triangle and gives back its area. Examples triArea(3, 2) ➞ 3 triArea(7, 4) ➞ 14 triArea(10, 10) ➞ 50 Notes The area of a triangle is: (base * height) / 2 Remember to return the result. If a challenge stumps you, seek hints in the Resources tab. If you're really st …

Make a function that determines the greatest possible length of a triangle's third edge, given that every side length is an integer. Examples nextEdge(8, 10) ➞ 17 nextEdge(5, 7) ➞ 11 nextEdge(9, 2) ➞ 10 Notes (side1 + side2) - 1 = maximum range of third edge. The side lengths of the triangle are positive integers. Don't forget to return …

Build a function that returns the string "something" combined with a space " " followed by the supplied argument a. Examples giveMeSomething("is better than nothing") ➞ "something is better than nothing" giveMeSomething("Bob Jane") ➞ "something Bob Jane" giveMeSomething("something") ➞ "something something" Notes Assume an input is given.

Make a function that accepts an array holding only numbers and gives back its first element. Examples getFirstValue([1, 2, 3]) ➞ 1 getFirstValue([80, 5, 100]) ➞ 80 getFirstValue([-500, 0, 50]) ➞ -500 Notes The first element in an array always has an index of 0.

Build a function that turns a number of hours into seconds. Examples howManySeconds(2) ➞ 7200 howManySeconds(10) ➞ 36000 howManySeconds(24) ➞ 86400 Notes 60 seconds in a minute, 60 minutes in an hour Remember to return your answer.

Write a function that accepts a single number and gives back true whenever that value sits at zero or below, and returns false in every other case. Examples lessThanOrEqualToZero(5) ➞ false lessThanOrEqualToZero(0) ➞ true lessThanOrEqualToZero(-2) ➞ true Notes Remember to actually return your answer. Stuck partway through a challenge?

A farmer wants your help working out the grand total of legs walking around his property. He raises exactly three kinds of animal: chickens = 2 legs cows = 4 legs pigs = 4 legs He has already tallied his herd and hands you a headcount for each kind. Your job is to build a function that adds everything together and hands back the full nu …

PHP ships with one handy operator that hands you whatever is left over once a division is done. You'll get two numbers as parameters, and dividing the first by the second leaves some remainder, which might even be zero. Send that leftover back. Examples remainder(1, 3) ➞ 1 remainder(3, 4) ➞ 3 remainder(-9, 45) ➞ -9 remainde …

Build a function that gives back true when a string holds nothing at all, and false in any other situation. Examples isEmpty("") ➞ true isEmpty(" ") ➞ false isEmpty("a") ➞ false Notes A string made up purely of whitespace " " still does not count as empty here. Remember to return your answer. Stuck on this one? Grab a hint from the Resources tab. If …

Write a function that receives an age measured in years and returns that same age counted in days. Examples calcAge(65) ➞ 23725 calcAge(0) ➞ 0 calcAge(20) ➞ 7300 Notes Treat every year as 365 days for the purposes of this challenge. Don't worry about leap years or the days between someone's last birthday and today.

Write a function that accepts $length and $width and works out the perimeter of a rectangle from them. Examples findPerimeter(6, 7) ➞ 26 findPerimeter(20, 10) ➞ 60 findPerimeter(2, 9) ➞ 22 Notes Remember to return your answer. If you hit a wall, look for help in the Resources tab. Still totally stuck? The Solutions tab has you covered.

Bugsy needs to strip every digit out of a given string! Lend a hand by repairing the code in the code tab so it clears this challenge. Study the examples below to understand exactly what the function is meant to do. Examples removeNumbers("bugsy1") ➞ "bugsy" removeNumbers("12co23de") ➞ "code" removeNumbers("p1r2a3x4i5d6e") ➞ "praxide" …

Write a function that gives back true when an integer divides evenly by 5, and false in every other case. Examples divisibleByFive(5) ➞ true divisibleByFive(-55) ➞ true divisibleByFive(37) ➞ false Notes Remember to return your answer. Whenever a challenge trips you up, look for hints in the Resources tab. If you're really stuck, unlo …

You're handed two strings, firstName and lastName; hand back one string arranged in the format "last, first". Examples concatName("First", "Last") ➞ "Last, First" concatName("John", "Doe") ➞ "Doe, John" concatName("Mary", "Jane") ➞ "Jane, Mary" Notes Remember to return your answer. Whenever a challenge trips you up, find hints in the R …

Build a function that accepts an integer and returns true whenever it can be divided by 100, and false if it cannot. Examples divisible(1) ➞ false divisible(1000) ➞ true divisible(100) ➞ true Notes Remember to return your answer. Whenever a challenge trips you up, look for hints in the Resources tab. If you're really stuck, unlock solu …

Repair the code in the code tab so it clears this challenge (you'll only find syntax errors). Study the examples below to get a feel for what the function should do. Examples squared(5) ➞ 25 squared(9) ➞ 81 squared(100) ➞ 10000 Notes READ EVERY WORD CAREFULLY, CHARACTER BY CHARACTER! Don't overthink this one; it isn't meant to be …