What are considered false values?

In JavaScript, falsy values are those that become false when converted to a boolean. They include:

• false (logical "no")
• 0 (zero)
• -0 (negative zero)
• "" (empty string)
• null (absence of any value)
• undefined (absence of assigned value)
• NaN (Not-a-Number - result of an incorrect mathematical operation)

// Examples of conversion to boolean
console.log(Boolean(false));     // false
console.log(Boolean(0));         // false
console.log(Boolean(""));        // false
console.log(Boolean(null));      // false
console.log(Boolean(undefined)); // false
console.log(Boolean(NaN));       // false

These values are often used in conditional statements or logical expressions, where they are automatically converted to a boolean to determine the next steps of program execution.

// Using falsy values in a conditional statement
let someVariable = null;

if (someVariable) {
  console.log("This line will not execute because null is a falsy value.");
} else {
  console.log("This line will execute."); // Output: This line will execute.
}