Javascript snippets for you - #3

Welcome to the 3rd edition of essential JS snippets.

Abhiraj Bhowmick

2 years ago | 2 min read

Hello friends!
Hope you all are doing great.
Welcome back to my series of posts where I give 10 JS snippets every week amounting over to 50 essential JS snippets

1️⃣ average
This snippet returns the average of two or more numerical values.

const average = (...nums) => nums.reduce((acc, val) => acc + val, 0) / nums.length;
average(...[1, 2, 3]); // 2
average(1, 2, 3); // 2

2️⃣ averageBy
This snippet returns the average of an array after initially doing the mapping of each element to a value using a given function.

3️⃣ capitalizeEveryWord
This snippet capitalizes the first letter of every word in a given string.

const capitalizeEveryWord = str => str.replace(/\b[a-z]/g, char => char.toUpperCase());

capitalizeEveryWord('hello world!'); // 'Hello World!'

4️⃣ Create Directory
This snippet uses existsSync() to check whether a directory exists and then mkdirSync() to create it if it doesn’t.

const fs = require('fs');
const createDirIfNotExists = dir => (!fs.existsSync(dir) ? fs.mkdirSync(dir) : undefined);
createDirIfNotExists('test');
// creates the directory 'test', if it doesn't exist

5️⃣ deepFlatten
This snippet flattens an array recursively.

const deepFlatten = arr => [].concat(...arr.map(v => (Array.isArray(v) ? deepFlatten(v) : v)));

deepFlatten([1, [2], [[3], 4], 5]); // [1,2,3,4,5]

6️⃣ difference
This snippet finds the difference between two arrays.

const difference = (a, b) => {
const s = new Set(b);
return a.filter(x => !s.has(x));
};

difference([1, 2, 3], [1, 2, 4]); // [3]

7️⃣ differenceBy
This method returns the difference between two arrays, after applying a given function to each element of both lists.

8️⃣ differenceWith
This snippet removes the values for which the comparator function returns false.

const differenceWith = (arr, val, comp) => arr.filter(a => val.findIndex(b => comp(a, b)) === -1);

differenceWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0], (a, b) => Math.round(a) === Math.round(b));
// [1, 1.2]

9️⃣ digitize
This snippet gets a number as input and returns an array of its digits.

const digitize = n => [...`${n}`].map(i => parseInt(i));

digitize(431); // [4, 3, 1]

🔟 distance
This snippet returns the distance between two points by calculating the Euclidean distance.

const distance = (x0, y0, x1, y1) => Math.hypot(x1 - x0, y1 - y0);

distance(1, 1, 2, 3); // 2.23606797749979

Thank you for reading. Hope this has been of some help to you.
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Abhiraj

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Abhiraj Bhowmick

I make stuff on the web and write blogs about it.