beginner
7 min read
Arrow Functions Basics
JavaScript arrow functions let you write the same functions you already know in fewer lines. The idea isn't new—only the syntax is shorter.
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JavaScript Functions
Defining, calling, composing, and understanding reusable JavaScript functions and their behavior.
Tagged articles
JavaScript Functions articles
10 articles in this tag.
beginner
16 min read
Build a Digital Clock with JavaScript
There is a small magic moment in every beginner programmer's life: the first time a page changes itself, with no click, no refresh, no input from you. The…
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beginner
16 min read
Build a Modal Dialog with JavaScript
You have definitely seen a modal before. You clicked a button on a website, and a small window appeared on top of the page. Everything behind it went dark.…
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beginner
9 min read
Function Parameters and Return Values
A function that always does the same thing is a dead end. A function that can accept input and hand back a result becomes a tool you can reuse anywhere.
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beginner
7 min read
Introduction to Functions
Copying and pasting the same code over and over works for a while—until you need to change something and suddenly have to hunt through ten copies of the…
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beginner
6 min read
JavaScript Closures: How Functions Remember Variables
A function can outlive the variables it was born next to. That sentence sounds wrong until you run it.
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beginner
8 min read
JavaScript Scope: Global, Function, and Block Scope
You write a variable inside a function, log it, and it prints perfectly. You move that same console.log two lines down, outside the function, and suddenly…
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beginner
7 min read
JavaScript Object Methods and this: Use Data Inside a Method
You copy a method into a new variable, call it, and get undefined instead of the name you expected. Nothing in the object changed. Nothing in the function…
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beginner
9 min read
Recursion in JavaScript: Base Cases and Step-by-Step Tracing
That is the normal first experience with recursion. The function calls itself, the answer appears, and somewhere in the middle your mental model goes dark.…
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beginner
12 min read
JavaScript Function Practice Exercises
Reading about functions feels clear. Writing one from scratch feels different. That gap is normal—and it closes the same way for everyone: by running code,…
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