Truthy and Falsy JavaScript

Описание: In JavaScript, every object is associated with a boolean value. Another way to explain it is that every JavaScript object is either true or false in a boolean context.

In JavaScript, every object is "truthy" or "falsy". In other words, when converted to a boolean value, for example:

""
0
null
undefined

they will give a false value. Anything else will give a true value.

In JavaScript, we can change this value by adding double exclamation mark before the value.