When using the ____ logical operator one or both of the Subexpressions must be true for the compound expression to be true?

Logical AND (&&) evaluates operands from left to right, returning immediately with the value of the first falsy operand it encounters; if all values are truthy, the value of the last operand is returned.

If a value can be converted to true, the value is so-called truthy. If a value can be converted to false, the value is so-called falsy.

Examples of expressions that can be converted to false are:

• false;
• null;
• NaN;
• 0;
• empty string ("" or '' or ``);
• undefined.

The AND operator preserves non-Boolean values and returns them as they are:

result = '' && 'foo'; result = 2 && 0; result = 'foo' && 4;

Even though the && operator can be used with non-Boolean operands, it is still considered a boolean operator since its return value can always be converted to a boolean primitive. To explicitly convert its return value (or any expression in general) to the corresponding boolean value, use a double NOT operator or the Boolean constructor.

If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.