Examples from Week 2 Function Practice Exercises

functions.js

// Function to create a JavaScript library name generator:
// generateName("dog") should return "dog.js"
function generateName(name) {
  return name.endsWith('.') ? name + "js" : name + ".js";
}

let name = "cool"
let library = generateName(name);
console.log(name, library, generateName('cool.'));

// Check if a number is between two other numbers,
// being inclusive if the final argument is true:
// checkBetween(66, 1, 50, true) should return false.
function checkBetween(num, low, high, inclusive) {
  if(inclusive) {
    return num >= low && num <= high;
  }

  return num > low && num < high;
}

console.log(checkBetween(50, 1, 50), checkBetween(50, 1, 50, true));

// 4. Function to log all arguments larger than 255: showOutsideByteRange(1, 5, 233, 255, 256, 0)
// should log 256 to the console
function showOutsideByteRange() {
  for(let i = 0; i < arguments.length; i++) {
    let byte = arguments[i]
    if(byte > 255) {
      console.log(byte);
    }
  }
}

showOutsideByteRange(255, 1, 233, 255, 256, 300);

let showOutsideRange = function(low, high, ...values) {
  for(let i = 0; i < values.length; i++) {
    let value = values[i];
    if(value < low || value > high) {
      console.log(value);
    }
  }
};

showOutsideRange(0, 255, 1, -5, 233, 255, 256, 300);

// Function to calculate the HST (13%) on a purchase amount
function calculateHST(amount) {
  return amount * percent;
} 

function calculateHST(amount) {
  if(!percent) {
    percent = 0.13;
  }
  return amount * percent;
} 

function calculateHST(amount, percent) {
  percent = percent || 0.13
  return amount * percent;
} 

function calculateHST(amount, percent=0.13) {
  return amount * percent;
}