What are the features of logical operators?

Logical operators in Node.js (||, &&, !) have features related to their behavior and return values:

• || (OR): Returns the first "truthy" operand or the last operand if all are "falsy".
• && (AND): Returns the first "falsy" operand or the last "truthy" operand if all are "truthy".
• ! (NOT): Converts the operand to a boolean value and returns its inverse.

Features are related to "type coercion to boolean" (truthiness/falsiness):

• "Falsy" values: false, 0, '' (empty string), null, undefined, NaN.
• All other values are considered "truthy".

Operators || and && are "short-circuit" operators: they stop evaluation as soon as the result is known.

// Example of ||
const resultOr = 0 || 'hello' || true; // Returns 'hello'

// Example of &&
const resultAnd = 'hello' && 0 && true; // Returns 0

// Example of !
const resultNot = !'hello'; // Returns false
const resultNotNull = !null; // Returns true

Table of behavior for || and &&:

Expression	Result	Description
`a		b`
`a		b`
a && b	a if a is falsy	Returns a if a is falsy
a && b	b if a is truthy	Returns b if a is truthy