// Get Random Boolean

const getRandomBoolean = () => Math.random() >= 0.5;

console.log(getRandomBoolean());
// a 50/50 chance of returning true or false


// Check if the date is Weekend

const isWeekend = (date) => [0, 6].indexOf(date.getDay()) !== -1;

console.log(isWeekend(new Date(2021, 4, 14)));
// false (Friday)
console.log(isWeekend(new Date(2021, 4, 15)));
// true (Saturday)


// Check if a number is even or odd

const isEven = (num) => num % 2 === 0;

console.log(isEven(5));
// false
console.log(isEven(4));
// true


// Get the unique values in an array

const uniqueArr = (arr) => [...new Set(arr)];

console.log(uniqueArr([1, 2, 3, 1, 2, 3, 4, 5]));
// [1, 2, 3, 4, 5]


// Check if a variable is an array

const isArray = (arr) => Array.isArray(arr);

console.log(isArray([1, 2, 3]));
// true
console.log(isArray({ name: 'Ovi' }));
// false
console.log(isArray('Hello World'));
// false


// Generate a random number between two numbers

const random = (min, max) => Math.floor(Math.random() * (max - min + 1) + min);

console.log(random(1, 50));
// could be anything from 1 - 50


// Generate a random string (unique id?)

const randomString = () => Math.random().toString(36).slice(2);

console.log(randomString());
// could be anything!!!


// Scroll to the top of the page

const scrollToTop = () => window.scrollTo(0, 0);

scrollToTop();


// Toggle boolean

// bool is stored somewhere in the upperscope
const toggleBool = () => (bool = !bool);


// Calculate number of days between two dates

const daysDiff = (date, date2) => Math.ceil(Math.abs(date - date2) / 86400000);

console.log(daysDiff(new Date('2021-05-10'), new Date('2021-11-25')));
// 199


// Copy text to clipboard

const copyTextToClipboard = async (text) => {
  await navigator.clipboard.writeText(text);
};


// Different ways of merging multiple arrays

// Merge but don't remove the duplications
const merge = (a, b) => a.concat(b);
// Or
const merge = (a, b) => [...a, ...b];

// Merge and remove the duplications
const merge = [...new Set(a.concat(b))];
// Or
const merge = [...new Set([...a, ...b])];


// Get the actual type of javascript primitives

const trueTypeOf = (obj) => {
  return Object.prototype.toString.call(obj).slice(8, -1).toLowerCase();
};

console.log(trueTypeOf(''));
// string
console.log(trueTypeOf(0));
// number
console.log(trueTypeOf());
// undefined
console.log(trueTypeOf(null));
// null
console.log(trueTypeOf({}));
// object
console.log(trueTypeOf([]));
// array
console.log(trueTypeOf(0));
// number
console.log(trueTypeOf(() => {}));
// function


// Truncate string at the end

const truncateString = (string, length) => {
  return string.length < length ? string : `${string.slice(0, length - 3)}...`;
};

console.log(
  truncateString('Hi, I should be truncated because I am too loooong!', 36),
);
// Hi, I should be truncated because...


// Truncate string from the middle

const truncateStringMiddle = (string, length, start, end) => {
  return `${string.slice(0, start)}...${string.slice(string.length - end)}`;
};

console.log(
  truncateStringMiddle(
    'A long story goes here but then eventually ends!', // string
    25, // total size needed
    13, // chars to keep from start
    17, // chars to keep from end
  ),
);
// A long story ... eventually ends!


// Capitalizing a string

const capitalize = (str) => str.charAt(0).toUpperCase() + str.slice(1);

console.log(capitalize('hello world'));
// Hello world


// Check if the current tab is in view/focus

const isTabInView = () => !document.hidden;  // Not hidden

isTabInView();
// true/false


// Check if the user is on an Apple device

const isAppleDevice = () => /Mac|iPod|iPhone|iPad/.test(navigator.platform);

console.log(isAppleDevice);
// true/false


// The Ternary Operator

// Longhand
const age = 18;
let greetings;

if (age < 18) {
  greetings = 'You are not old enough';
} else {
  greetings = 'You are young!';
}

// Shorthand
const greetings = age < 18 ? 'You are not old enough' : 'You are young!';


// Short-circuit Evaluation Shorthand

// Longhand
if (name !== null || name !== undefined || name !== '') {
  let fullName = name;
}

// Shorthand
const fullName = name || 'buddy';