From Anonymous to Arrow Functions
Explore how arrow functions provide a concise alternative to anonymous functions in JavaScript. Understand syntax differences, parameter handling, and how arrow functions enhance code clarity and reduce clutter when passing functions as arguments.
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Anonymous functions have been in JavaScript from day one. Now, newer arrow functions, reduce clutter and make the code more expressive. At first sight, arrow functions may appear to be a direct replacement for anonymous functions, but significant semantic differences exist between them. Learning these differences is critical to avoid surprises when you’re refactoring code to use arrow functions.
Three ways to define JavaScript functions
In JavaScript, there are three different ways to define a function.
Regular functions
A named function uses the function keyword followed by the name of the
function.
For example, the following code defines a function named sqr:
function sqr(n) { return n * n; }
Anonymous functions
An anonymous function has the same structure, except it does not have a name—it’s anonymous. An anonymous function can be passed to another function as an argument or stored into a variable.
For example, ...