v0.413 tracks livelast build: current milestone
Learn a language by
mapping it
to the one you already use.
Guided learning tracks for experienced developers. Each track translates familiar mental models into the shapes, tradeoffs, and habits of a new language — no beginner-level detours.
~/langfor/pick-trackclick chips to refine
$langfor--from Rust--to Python
• from · what you know4 options
→
C#/.NET
TypeScript↳/rust-to-python · Keep useful explicitness while adapting to Python's lighter conventions.
•source chips set what you already know•target chips stay scoped to valid matches•open track jumps straight to the suggested path
02track matrix
Every supported pair, at a glance. Hover a row and column to inspect what is live, then jump straight into the matching transition.
from ↓to →
Go
Rust
Python
JavaScript
TypeScript
C#
Python
—
JavaScript
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Go
—
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·
·
Rust
—
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↳ /python-to-rust · Learn ownership, enums, and compiler-guided design.
03featured tracks
Hand-picked starting points if you want a strong next step without browsing the full catalog first.
Most popular start
PythonGo
Move into a simpler, explicit compiled language.
A strong first comparison if you want a simpler compiled model without leaving backend work behind.
open track Biggest mindset shift
PythonRust
Learn ownership, enums, and compiler-guided design.
A deeper jump for developers ready to trade Python flexibility for compiler-guided design.
open track Lowest-friction upgrade
JavaScript/NodeTypeScript
Turn familiar JavaScript runtime code into safer, better-specified systems.
A pragmatic path when you already know the runtime and want better guarantees at the boundaries.
open track 04inside a lesson
Each lesson starts from a source-language instinct, then shows the target-language pattern that usually replaces it. Side by side. Same example, two minds.
python-to-go / 04 · syntax / error handling
From try/except→err != nil
Once the pattern clicks, Go error handling feels less like ceremony and more like a habit that keeps surprising control flow out of the codebase.
Python
def render_dashboard(user_id):
try:
profile = load_profile(user_id)
stats = load_stats(user_id)
except ProfileError as exc:
logger.warning("profile unavailable: %s", exc)
return None
return build_dashboard(profile, stats)Go
func renderDashboard(userID int) (*Dashboard, error) {
profile, err := loadProfile(userID)
if err != nil {
log.Printf("profile unavailable: %v", err)
return nil, err
}
stats, err := loadStats(userID)
if err != nil {
return nil, err
}
dashboard := buildDashboard(profile, stats)
return &dashboard, nil
}