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sfhero · Salesforce Apex

Learn Apex

Pick a topic — each opens on its own page with interactive examples and short, practical code you can read like a teammate left you notes.

Access modifiers

private through global — short rules, full class examples, and a live “who can see” grid.

List, Set, Map — read Apex-shaped snippets, then play with the sandbox.

Build a SELECT … FROM … WHERE … LIMIT query — watch the string and the binding pattern.

Trigger context

Insert, update, delete — see which Trigger.new / old / maps exist for each event.

Exceptions & nulls

Walk try/catch/finally paths and compare null checks vs String.isBlank for real data.

Sharing in Apex

with / without / inherited sharing — mini org simulator, live class shape, scenario cards.

Permission sets

Stack profiles + sets on a toy user — see CRUD merge, field-level badges, myth cards.

Apex best practices

Governor toy bars, SOQL/DML flip code, tap-the-safe-snippet quiz, habit checklist.

OWD + peer rule on/off — see when Bob can see Alice’s Account (toy model).

Organization-wide defaults — Private vs Public Read vs Read/Write baselines.

Apex managed sharing

Toggle a simulated AccountShare — see Apex creating share rows in code.

Order of execution

Step through triggers, validation, automation — simplified pipeline.

Variables & data types

Integer, Decimal, String, Boolean, Id, Date — tap each for notes and snippets.

insert / update / delete / upsert / undelete — flip examples, match op to story.

Slider batch size, naive vs bulkified — watch SOQL/DML counts move.

Governor limits

Toy pressure dial filling SOQL / DML / CPU / heap bars — mitigations list.

Static vs instance

Tap to increment — instance vs static counters side by side.

Overload picks — which new Service(...) maps to which constructor.

Dog / Cat / Bird — runtime type picks speak(); virtual/override snippet.

Context variables

isInsert, isUpdate, isBefore, size, operationType — tap event; table updates live.

Trigger.new vs Trigger.old

Sliders for old vs new Amount — “changed?” panel flips when they differ.

Recursion prevention

Toggle static guard — simulate save; counter explodes or stays controlled.

Trigger order of execution

Shuffle trigger names — reveal alphabetical run order (same object).

Sync vs @future box — fire async (toy) and see the separate transaction idea.

enqueueJob — queued → done animation; minimal Queueable snippet.

Slide total rows + batch size — watch execute() count update.

Presets (hourly / daily / weekly) — cron string and plain English.

Chaining Queueables

Next step — Job A/B lights up as you walk the chain (toy).