True, false, and null

Write Apex · Beginner · 12 min · Runs in your Salesforce Developer org · Free

Scenario. Marketing adds 10 points when a Lead attends a webinar. Some Leads have no score yet.

Give a missing Lead score a default before doing math, then decide if the Lead is hot in three cases.

What you will learn

A Boolean is true or false. A missing value is null. Comparing null is safe: null >= 80 is false. Math is not: null + 10 throws. Default a nullable first.

Integer safeScore = score == null ? 0 : score;
Integer sameScore = score ?? 0; // shorter

Booleans combine with && (and), || (or), ! (not). !isClosed means "not closed". Join tests: score >= 80 && !isClosed.

Gotcha. Null is not zero. score == 0 is false when score is null.

The task

Add a 10-point webinar bonus to a Lead score, then decide if the Lead is hot, for three cases.

Examples:

no score, Lead open → Null boosted: 10 and Null hot: false
score 75, Lead open → Open boosted: 85 and Open hot: true
score 75, Lead closed → Closed hot: false

Requirements:

Give a null leadScore a default of 0 before you add the bonus. Use ? : or ??.
Add 10 bonus points to the safe score.
The Lead is hot when the boosted score is 80 or more and the Lead is open. Join the two tests with &&.
Print Null boosted: and Null hot: for case A, Open boosted: and Open hot: for case B, and Closed hot: for case C.

Starter code

Integer leadScore = null;
Boolean isClosed = false;

// Case A: no score yet, Lead open

// Case B: score 75, Lead open
leadScore = 75;

// Case C: same Lead, now closed
isClosed = true;

When it passes

Case A prints 10 and false, case B prints 85 and true, and case C prints false. Nothing throws a NullPointerException.

Try this drill free

You write the Apex yourself. ApexSensei runs it and tells you what passed and what did not.

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