Web Reference: Jul 8, 2025 · The logical OR (||) (logical disjunction) operator for a set of operands is true if and only if one or more of its operands is true. It is typically used with boolean (logical) values. When it is, it returns a Boolean value. In this tutorial, you will learn how to use JavaScript logical operators including logical NOT (!) AND (&&), and OR (|) operators. When programming, a lot of values can be falsey (like 0, empty strings, false, undefined, null, NaN). However, sometimes you want to check if a variable is nullish (either undefined or null), like when it is okay for a variable to be an empty string, or a false value.
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