Web Reference: Feb 16, 2023 · Function parameters with default values are initialized with default values if they contain no value or are undefined. JavaScript function parameters are defined as undefined by default. Default function parameters allow named parameters to be initialized with default values if no value or undefined is passed. You’ll walk away knowing exactly when a default kicks in (and when it does not), how defaults interact with undefined, null, destructuring, and constructors, and which patterns I recommend in 2026 codebases (including how to avoid the old || traps).
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