1// JS Tip of the Day
2// Array truncation
3
4const heroes = ['Batman', 'Superman', 'Green Arrow', 'Wonder Woman'];
5console.log(heroes.length); // 4
6
7heroes.length = 2; // Quick truncation!
8console.log(heroes.length); // 2
9console.log(heroes); // ['Batman', 'Superman']

1// JS Tip of the Day
2// Insert Elements into a Specific Index of an Array
3
4const heroes = ['Batman', 'Wonder Woman'];
5
6const insertAt = (array, index, ...items) => {
7    array.splice(index, 0, ...items);
8  	return array; // return the array if you want
9}
10
11console.log(insertAt(heroes, 1, 'Green Arrow', 'Superman'));
12// ['Batman', 'Green Arrow', 'Superman', 'Wonder Woman']

1// JS Tip of the Day
2// Calling a function only if a condition is true
3
4const myFavouriteHero = "Batman";
5const callHero = (hero) => console.log(`Help me ${hero}!`); 
6
7
8// Longhand 
9if (myFavouriteHero) {
10 callHero(myFavouriteHero); // Help me Batman!
11} 
12// Shorthand 
13myFavouriteHero && callHero(myFavouriteHero); // Help me Batman!

1// JS Tip of the Day
2// Get a Random Number in a Range (max included)
3
4const randomInRange = (min, max) => {
5  return Math.floor(Math.random() * (max - min + 1)) + min;
6}
7
8console.log(randomInRange(20, 50)); // 34

1// JS Tip of the Day
2// Check for positive number
3
4const isPositiveNumber = num => !!Math.max(0, num);
5
6console.log(isPositiveNumber(200)); // true 
7console.log(isPositiveNumber(-200)); // false