number-drills.js

'use strict';

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

let n1 = prompt("First number?");
let n2 = prompt("Second number?");
console.log("Area is " + computeArea(n1,n2));

/* 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();

//***********************************************************

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

function fahrToCels(fahrTemp) {
  return (fahrTemp - 32) * 5/9
}

console.log(`If Celsius is ${n1}, then Farhenheit is ` + celsToFahr(n1));

console.log(`If Farhenheit is ${n2}, then Celsius is ` + fahrToCels(n2));


/* 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();

//***********************************************************

function isDivisible(dividend, divisor) {
  return (dividend % divisor) === 0;
};

console.log(isDivisible(n1,n2));

/* 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();