[Solved] You want to create a computed signal that returns the full name by combining two... Which code correctly updates the full name when either signal changes and avoids unnecessary recomputations? | Angular

Angular - Signals

You want to create a computed signal that returns the full name by combining two signals: firstName and lastName. Which code correctly updates the full name when either signal changes and avoids unnecessary recomputations?

Aconst fullName = computed(() => firstName() + lastName());

Bconst fullName = signal(`${firstName()} ${lastName()}`);

Cconst fullName = computed(() => firstName + ' ' + lastName);

Dconst fullName = computed(() => `${firstName()} ${lastName()}`);

Step-by-Step Solution

Solution:

Step 1: Understand the goal
The computed signal should combine firstName and lastName signals and update automatically when either changes.
Step 2: Evaluate each option
const fullName = computed(() => `${firstName()} ${lastName()}`); correctly calls both signals as functions and concatenates with a space. const fullName = signal(`${firstName()} ${lastName()}`); uses signal which won't update automatically. const fullName = computed(() => firstName + ' ' + lastName); uses signal variables directly without calling them. const fullName = computed(() => firstName() + lastName()); concatenates without space.
Final Answer:
const fullName = computed(() => `${firstName()} ${lastName()}`); -> Option D
Quick Check:
Call signals with () and combine with space [OK]

Quick Trick: Use computed with template literals calling signals () [OK]

Common Mistakes:

Using signal() instead of computed() for derived values
Not calling signals as functions
Forgetting space between names

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More Angular Quizzes

Which code correctly updates the full name when either signal changes and avoids unnecessary recomputations?

Step 1: Understand the goal

Step 2: Evaluate each option

Final Answer:

Quick Check:

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