TIL(Tuesday 13 October 2020)

Twitter can be really useful at times, it’s where I found this article, titled Javascript You Need To Know For React.

Shorthand property names

const id = 2
const name = 'Bhanu'
const count = 2

const user = {
    blogs: count,

I’ve seen & used this in the wild, just didn’t know what it was.

Optional Chaining

Consider the expression a?.b. This expression evaluates to a.b if a is not null and not undefined, otherwise, it evaluates to undefined You can even chain this multiple times like a?.b?.c

Nullish Coalescing Operator

Consider the expression a ?? b. This evaluates to b if a is null or undefined, otherwise, it evaluates to a

Another one I’ve seen & used in the wild, with no idea what it was.


The array reduce method reduces the array of values into a single value. It executes the callback function for each value of the array.

const array1 = [1, 2, 3, 4];
const reducer = (accumulator, currentValue) => accumulator + currentValue;

// 1 + 2 + 3 + 4
// expected output: 10

// 5 + 1 + 2 + 3 + 4
console.log(array1.reduce(reducer, 5));
// expected output: 15

JavaScript Modules and how to effectively work with Export Import

Well written article by Tapas Adhikary. Concise.