Logical Operators

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Logical Operators

Operator Description Useage
Logical AND (&&) expr1 && expr2 Returns expr1 if it can be converted to false; otherwise, returns expr2. Thus, when used with Boolean values, && returns true if both operands are true; otherwise, returns false.
Logical OR (||) expr1 || expr2 Returns expr1 if it can be converted to true; otherwise, returns expr2. Thus, when used with Boolean values, || returns true if either operand is true.
Logical NOT (!) !expr Returns false if its single operand can be converted to true; otherwise, returns true.

Falsy

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

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