15 Short & Sweet JavaScript Snippets

JavaScript is an incredibly versatile and powerful programming language, widely used for web development. Whether you're a seasoned developer or just starting out, having a handy set of JavaScript snippets can save you time and streamline your coding process. In this article, I've compiled 15 short and sweet JavaScript snippets that cover a variety of tasks. Let's dive in!

01. Get current data and time

const currentDateTime = new Date();
console.log(currentDateTime);

02. Find max number in array

const number = [5, 2, 7, 10, 1]
const maxNumber = Math.max(...number)

// 10

03. Shuffle array

function shuffleArray(array) {
    return array.sort(() => Math.random() - 0.5);
}

04. Generate random number between 1 and 10

const randomNumber = Math.floor(Math.random() * 10) + 1;
console.log(randomNumber);

// 7

05. Convert String to lowercase

const str = 'Hello, World!'
console.log(str.toLowerCase());

// hello, world!

06. Check if even or odd number

const num = 5;
if (num % 2 === 0) {
    console.log('Number is even');
} else {
    console.log('Number is odd');
}

// 'Number is odd'

07. Create a simple 10 second countdown timer

let seconds = 5;
const countdown = setInterval(() => {
    console.log(seconds);
    seconds--;
    if (seconds < 0) {
        clearInterval(countdown);
        console.log('Countdown finished!');
    }
}, 1000);


// 5
// 4
// 3
// 2
// 1
// Countdown finsihed!

08. Convert array of numbers to array of strings

const numbers = [1, 2, 3, 4, 5];
const strings = numbers.map(String);
console.log(strings);

// ['1', '2', '3', '4', '5']

09. Remove duplicates

let arr = ["apple", "mango", "apple", "orange", "mango", "mango"];
const removeDuplicates = arr => [...new Set(arr)];
console.log(removeDuplicates(arr));

// ['apple', 'mango', 'orange']

10. Convert sentence to array of words

const sentence = "This is a sentence";
const words = sentence.split(" ");
console.log(words);

// ['This', 'is', 'a', 'sentence']

11. Repeat string

function repeatString(str, n){
    return str.repeat(n);
}

const repeatedStr = ('abc', 3);
console.log(repeatedStr);

// 'abcabcabc'

12. Find intersection of arrays

// Define the intersection function
const intersection = (a, b) => a.filter(value => b.includes(value));

// Example arrays
const arrayA = [1, 2, 3, 4, 5];
const arrayB = [4, 5, 6, 7, 8];

// Use the intersection function to find common elements
const result = intersection(arrayA, arrayB);

// Log the result to the console
console.log(result);

// [4, 5]

13. Create dynamic strings

const name = 'Matin Imam';
const greeting = `Hello, ${name}!`;
console.log(greeting); // "Hello, Matin Imam!"

14. Merge objects

const person = {name: 'Matin'};
const details = {work: 'Developer'};

const fullDetails = {...person, ...details};
console.log(fullDetails);

// {name: 'Matin', age: 30}

15. Redirect to new URL after a delay

setTimeout(() => location.href = "https://www.linkedin.com/in/matin-imam/", 5000);

These 15 JavaScript snippets are just a glimpse of what you can achieve with a few lines of code. Whether you're manipulating arrays, strings, or working with dates and times, these snippets can help streamline your development process.

source: dev.to