Here's a quick, friendly intro to the way Praxide challenges work. Head to the Code tab above and you'll spot a starter function that looks just like this: public static boolean returnTrue() { } All you need to do is pop return true; between the curly braces { } and then tap the Check button. Nail it and the button lights up to ce …

Build a method that accepts two integers as its arguments and hands back their total. Examples SumOfTwoNumbers(3, 2) ➞ 5 SumOfTwoNumbers(-3, -6) ➞ -9 SumOfTwoNumbers(7, 3) ➞ 10 Notes Remember to actually return your answer. Stuck partway through? Peek at the hints waiting in the Resources tab. Totally blocked? Reveal the answer in the S …

Craft a function that receives 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 hand back your result. Feeling stuck on this one? Grab a hint from the Resources tab. Still puzzled? Unlock the walkthrough in the Solutions tab.

Build a function that receives a number as its input, bumps that value up by +1, and hands back the fresh result. Examples addition(0) ➞ 1 addition(9) ➞ 10 addition(-3) ➞ -2 Notes Remember to actually send your answer back. Whenever a puzzle has you stumped, grab a hint from the Resources tab. And if you're truly stuck, unlock the walkthrough in the So …

Build a function that gives back true whenever num1 lines up with num2, and false in every other case. Examples isSameNum(4, 8) ➞ false isSameNum(2, 2) ➞ true isSameNum(42, 32) ➞ false Notes Remember to actually send your answer back.

You're handed an object that stores how many upvotes and downvotes something picked up, and your job is to work out the score to show on screen. Simply take upvotes and subtract downvotes from it. Examples getVoteCount({ upvotes: 13, downvotes: 0 }) ➞ 13 getVoteCount({ upvotes: 2, downvotes: 33 }) ➞ -31 getVoteCount({ upvotes: 132, downv …

Put together a function that turns a count of hours into the matching number of seconds. Examples howManySeconds(2) ➞ 7200 howManySeconds(10) ➞ 36000 howManySeconds(24) ➞ 86400 Notes A minute holds 60 seconds and an hour holds 60 minutes. Return your answer.

Build a function that receives a length and a width, then figures out the perimeter of the rectangle they form. Examples findPerimeter(6, 7) ➞ 26 findPerimeter(20, 10) ➞ 60 findPerimeter(2, 9) ➞ 22 Notes Remember to hand your answer back. Feeling stuck? Grab a hint from the Resources tab. Still stuck? Peek at the answers in the Solutions tab.

Build a function that receives a voltage and a current, then hands back the resulting power. Examples power(230, 10) ➞ 2300 power(110, 3) ➞ 330 power(480, 20) ➞ 9600 Notes N/A

Build a function that accepts two integers and reports whether they match exactly. Examples isEqual(5, 6) ➞ false isEqual(1, 1) ➞ true isEqual(36, 35) ➞ false Notes N/A

Build a function that works out the largest possible length a triangle's third edge can reach when every side length is a whole 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 …

Craft a function that receives a triangle's base and height, then returns the area it covers. Examples triArea(3, 2) ➞ 3 triArea(7, 4) ➞ 14 triArea(10, 10) ➞ 50 Notes The area of a triangle is: (base * height) / 2 Don't forget to return the result. If you get stuck on a challenge, find help in the Resources tab. If you're really st …

Build a method that receives a single integer argument and returns true when that value sits at or below zero, otherwise return false. Examples lessThanOrEqualToZero(5) ➞ false lessThanOrEqualToZero(0) ➞ true lessThanOrEqualToZero(-2) ➞ true Notes Don't forget to return the result. If you get stuck on a challenge, find …

Java offers one handy operator that gives you the remainder left over from a division. Your function receives two numbers as parameters, and dividing the first by the second leaves a remainder that could even be zero. Send that value back. Examples remainder(1, 3) ➞ 1 remainder(3, 4) ➞ 3 remainder(-9, 45) ➞ -9 remaind …

Build a function that takes the string "something" and glues it together with a space " " and the provided 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.

Patch the code over in the Code tab so that the function returns true precisely when x is equal to 7. Examples Challenge.isSeven(4) ➞ false Challenge.isSeven(9) ➞ false Challenge.isSeven(7) ➞ true Notes This bug likes to hide, so inspect every line!

A learner picking up Java was trying to write a function. Their code should join a passed string name with the string "Praxide" and stash the result in a variable called result. They could use your help getting this code working. Examples nameString("Kiran") ➞ "KiranPraxide" nameString("Theo") ➞ "TheoPraxide" nameString("java") ➞ "javaPraxide" …

Build a function that receives an age in years and hands back that same age counted in days. Examples calcAge(65) ➞ 23725 calcAge(0) ➞ 0 calcAge(20) ➞ 7300 Notes Treat 365 days as one full year for this challenge. Skip leap years and the days between the last birthday and now. Expect only positive integer inputs.

Given a pair of numbers, hand back true when the sum of both numbers stays below 100. Otherwise hand back false. Examples lessThan100(22, 15) ➞ true // 22 + 15 = 37 lessThan100(83, 34) ➞ false // 83 + 34 = 117 lessThan100(3, 77) ➞ true Notes N/A

Build a function that receives a name and gives back a friendly greeting shaped as a string. Examples helloName("Gerald") ➞ "Hello Gerald!" helloName("Tiffany") ➞ "Hello Tiffany!" helloName("Ed") ➞ "Hello Ed!" Notes The input will always be a name (as a string). Never leave off the exclamation mark! If a challenge has you stuck, find he …