January 2020
Intermediate to advanced
548 pages
13h 36m
English
Content preview from Clean Code in JavaScript
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Logical operators
Logical operators are typically used to build logical expressions where the result of the expression informs some action or inaction. There are three logical operators in JavaScript:
- The NOT operator (!a)
- The AND operator (a && b)
- The OR operator (a || b)
As with most other operators, they can accept a variety of types and will coerce as necessary. The AND and OR operators, unusually, do not always evaluate to a Boolean value, and both utilize a mechanism called short-circuit evaluation to only execute both operands if some condition is met. We'll learn more about this as we explore each individual logical operator.
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