JavaScript Booleans (With Example)

JavaScript Booleans are used to represent truthy and falsy values. They are critical for controlling the flow of a program through conditional statements, loops, and logical expressions.

A Boolean can only have two values: true: Indicates a condition is correct or a statement is valid. false: Indicates a condition is incorrect or a statement is invalid.

Booleans allow developers to create conditions that decide which part of the code should execute. For example, if statements use Booleans to determine whether to run a block of code.

Booleans only represent true or false, while other data types like numbers or strings can hold a range of values. Additionally, other data types can be converted to Booleans to determine their "truthiness" or "falsiness."

The typeof operator returns "boolean" when used with a primitive Boolean value, such as true or false.

Truthy values are values that evaluate to true in a Boolean context, while falsy values evaluate to false. Examples of falsy values include 0, "", null, undefined, NaN, and false. All other values are truthy.

Yes. A Boolean object, created using new Boolean(), is always truthy even if it contains the value false. This can lead to unexpected behavior and is why primitive Booleans are preferred.

== compares two values for equality after converting them to a common type. === compares both the value and the type without type coercion. It is more strict and preferred.

Using new Boolean() creates a Boolean object, not a primitive. Boolean objects are always truthy, which can cause bugs in conditional checks. Primitive Booleans (true or false) are simpler and safer to use.

You can use the Boolean() function to convert a value to its Boolean equivalent. For example, Boolean(1) returns true, and Boolean(0) returns false.