area-of-a-rectangle

// https://repl.it/@robertaxelkirby/area-of-a-rectangle-drill

function computeArea(width, height) {
	return width * height;
}

/* From here down, you are not expected to 
   understand.... for now :)  
   
   
   Nothing to see here!
   
*/

// tests

function testComputeArea() {
  let width = 3;
  let height = 4;
  let expected = 12;
  if (computeArea(width, height) === expected) {
    console.log('SUCCESS: `computeArea` is working');
  } else {
    console.log('FAILURE: `computeArea` is not working');
  }
}

testComputeArea();

Is-Divisible

// https://repl.it/@robertaxelkirby/Is-divisible-drill

function isDivisible(divisee, divisor) {
  if (divisee % divisor == 0) {
  	return true;
  } 
  return false;
}

/* From here down, you are not expected to 
   understand.... for now :)  
   
   
   Nothing to see here!
   
*/

// tests

function testIsDivisible() {
  if (isDivisible(10, 2) && !isDivisible(11, 2)) {
    console.log('SUCCESS: `isDivisible` is working');
  } else {
    console.log('FAILURE: `isDivisible` is not working');
  }
}

testIsDivisible();

temperature-conversion

// https://repl.it/@robertaxelkirby/temperature-conversion-drill

function celsToFahr(celsTemp) {
//	[°F] = [°C] × 9⁄5 + 32
	return celsTemp * 9/5 + 32
}

function fahrToCels(fahrTemp) {
//	[°C] = ([°F] − 32) × 5⁄9 
	return (fahrTemp - 32) * (5-9)
}

/* From here down, you are not expected to 
   understand.... for now :)  
   
   
   Nothing to see here!
   
*/

// tests

function testConversion(fn, input, expected) {
  if (fn(input) === expected) {
    console.log('SUCCESS: `' + fn.name + '` is working');
    return true;
  } else {
    console.log('FAILURE: `' + fn.name + '` is not working');
    return false;
  }
}

function testConverters() {
  let cel2FahrInput = 100;
  let cel2FahrExpect = 212;
  let fahr2CelInput = 32;
  let fahr2CelExpect = 0;

  if (
    testConversion(celsToFahr, cel2FahrInput, cel2FahrExpect) &&
    testConversion(fahrToCels, fahr2CelInput, fahr2CelExpect)
  ) {
    console.log('SUCCESS: All tests passing');
  } else {
    console.log('FAILURE: Some tests are failing');
  }
}

testConverters();