Web Reference: Function Definitions vs Function Declarations Function definition is a general term for defining a function. Function declaration is one specific way to define a function. Examples of function definitions include: Function declarations Function expressions Arrow functions Jul 8, 2025 · Defining functions Function declarations A function definition (also called a function declaration, or function statement) consists of the function keyword, followed by: The name of the function. A list of parameters to the function, enclosed in parentheses and separated by commas. The JavaScript statements that define the function, enclosed in curly braces, { /* … */ }. For example, the ... Mar 15, 2026 · Confused between function declarations and function expressions in JavaScript? This guide breaks down the differences, hoisting behavior, and when to use each — with clear code examples.
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