In this Article we will go through how to check if a value is a function only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isFunction = v => ['[object Function]', '[object GeneratorFunction]', '[object AsyncFunction]', '[object Promise]'].includes(Object.prototype.toString.call(v));

In this Article we will go through how to check if a value is a generator function only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isGeneratorFunction = v => Object.prototype.toString.call(v) === '[object GeneratorFunction]';

In this Article we will go through how to check if a value is an async function only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isAsyncFunction = v => Object.prototype.toString.call(v) === '[object AsyncFunction]';

In this Article we will go through how to compose functions from left to right only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

// Compose functions from left to right
const pipe = (...fns) => x => fns.reduce((y, f) => f(y), x);

In this Article we will go through how to compose functions only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

// Compose functions from right to left
const compose = (...fns) => x => fns.reduceRight((y, f) => f(y), x);

In this Article we will go through how to create a function that accepts a single argument only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const unary = fn => arg => fn(arg);

In this Article we will go through how to get the yesterday date only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const yesterday = (d => new Date(d.setDate(d.getDate() - 1)))(new Date);

In this Article we will go through how to initialize the current date but set time to midnight only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const midnightOfToday = () => new Date(new Date().setHours(0, 0, 0, 0));

In this Article we will go through how to sort an array of dates only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const sortDescending = arr => arr.sort((a, b) => a.getTime() > b.getTime());
const sortAscending = arr => arr.sort((a, b) => a.getTime() < b.getTime());

In this Article we will go through how to check if an element is a descendant of another only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isDescendant = (child, parent) => parent.contains(child);