In JavaScript, truthy are expressions which evaluate to boolean true
value and falsy evaluates to boolean false
value. Unlike other languages, true
and false
values are not limited to boolean
data types and comparisons. It can have many other forms.
As well as a type, each value also has an inherent boolean value, generally known as either truthy or falsy. Some of the rules are a little bizarre so understanding the concepts and effect on comparison helps when debugging JavaScript applications.
The following values are always falsy:
false
0
(zero)''
or ""
(empty string)…
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You probably already know a lot about JavaScript from the internet, especially MDN Web Docs. But that knowledge of yours has just been rubbed a little further, where you will learn about something unknown. Because JavaScript is a confusing language of the whole world.
So let’s turn around a bit.
In JavaScript, the textual data is stored as strings. There is no separate type for a single character. Simply put, a string is a collection of characters.
Quotes
Let’s recall the kinds of quotes.
Strings can be enclosed within either single quotes, double quotes, or backticks:
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