The tweened() Store: Duration and Easing
Interpolate values over a fixed duration with built-in or custom easing.
The tweened() Store: Duration and Easing is a free Sveltejs Academy lesson on CoddyKit. This is lesson 2 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Sveltejs Academy learning path, and your progress syncs across the web and the CoddyKit app. The Sveltejs Academy course includes 4 lessons in total.
Duration-Based
The tweened store animates over a fixed duration with an easing function.
Create One
Pass initial value and options.
import { tweened } from "svelte/motion";
const p = tweened(0, { duration: 500, easing: cubicOut });Animate to a Target
Call set with the new value. The store animates over the duration.
p.set(100);Update Method
Animate based on the current value.
p.update(n => n + 1);Subscribe
Use $p in markup.
<progress value={$p} max="100"></progress>Custom Easing
Pass any easing function from svelte/easing or your own.
Object Targets
Like spring, tweened can animate object values.
Override Per Call
set accepts a second options arg to override duration/easing for one transition.
p.set(0, { duration: 1000 });When to Use
Prefer tweened over spring when you need predictable, time-based motion.
Use Cases
Progress bars, gauges, sequenced animations.
Performance
Like spring, tweened uses rAF internally for smooth motion.
Quick Check
What is the main difference between tweened and spring?
Recap
tweened animates values over a fixed duration with easing. Use it for predictable, time-based motion.
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Frequently Asked Questions
Is the “The tweened() Store: Duration and Easing” lesson free?
Yes — the full text of “The tweened() Store: Duration and Easing” is free to read here on the web. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Sveltejs Academy course, upgrade to CoddyKit PRO. The Sveltejs Academy course includes 4 lessons in total.
What will I learn in “The tweened() Store: Duration and Easing”?
Interpolate values over a fixed duration with built-in or custom easing. You practise Sveltejs Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Sveltejs Academy?
No prior experience is required. Sveltejs Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 2 of 4.
How long does the “The tweened() Store: Duration and Easing” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Sveltejs Academy lesson?
Yes. Every Sveltejs Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- The spring() Store: Physics-Based Animation
- The tweened() Store: Duration and Easing
- Interpolation Functions
- Animating SVG Paths with Motion