Here are some handy, simple ways to manipulate CSS classes.
Use Date.prototype.getDay() to check weekend by using a modulo operator (%).
Operators are the symbols between values that allow different operations like addition, subtraction, multiplication, and more.
Find all matching elements on a page. You can use any valid CSS selector.
Use Array.prototype.length – 1 to compute the index of the last element of the given array and return it, otherwise return undefined.
A boolean value is one that can either be TRUE or FALSE. If you need to know “yes” or “no” about something, then you would want to use the boolean function.
Assume that we want to copy a given text to the clipboard. Here’s how.