How to add am pm suffix to an hour in JavaScript

In this Article we will go through how to add am pm suffix to an hour 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 suffixAmPm = h => `${h % 12 === 0 ? 12 : h % 12}${h < 12 ? 'am' : 'pm'}`;

Parameters h is an hour number between 0 and 23.

suffixAmPm(0);      // '12am'
suffixAmPm(5);      // '5am'
suffixAmPm(12);     // '12pm'
suffixAmPm(15);     // '3pm'
suffixAmPm(23);     // '11pm'