Salesforce JavaScript Developer Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Declaring an arrow function in JavaScript involves using a concise syntax that allows for the creation of functions without the need for the traditional function keyword. The correct choice uses the syntax that requires parentheses for the parameters, followed by an arrow (=>) and then the function body, enclosed in curly braces if there are multiple statements. This compact form makes it easier to write and read the code, especially for functions that consist of a single expression.

When using this syntax, if the function body has only a single expression, the curly braces and the return keyword can be omitted, simplifying the function even further. For example, a function that takes a number and returns its square could be succinctly written as `const square = number => number * number;`.

The other options do not accurately reflect the standard syntax for arrow functions. For example, stating the parameters in curly braces or incorrectly using the colon does not conform to JavaScript's syntax for defining arrow functions, thereby leading to misunderstandings of how to properly create them in practical scenarios.