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Adaface Sample TypeScript Questions

Here are some sample TypeScript questions from our premium questions library (10273 non-googleable questions).

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🧐 Question

Medium

Alias
OOPs
Solve
What does the following TypeScript code print?
 image
 image

Medium

Truthiness
Narrowing
Solve
We wrote the following TypeScript function to work as global print function. The function needs to handle string input, an array of strings as input or null as an input. In case of string and array of strings, it needs to print them to console. For null input, the code should not print anything.
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The function is throwing an error when it is called with null - globalConsole(null). This is happening because typeof null is ‘object’ in JavaScript. Here are two modifications of the code to handle this case:
 image
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Pick the correct statements:
            
            A: In the case of null input, globalConsole1 won’t produce any compiler errors like globalConsole
            B: In the case of null input, globalConsole2 won’t produce any compiler errors like globalConsole
            C: globalConsole1 will differ from globalConsole for an empty string
            D: globalConsole2 will differ from globalConsole for an empty string

Hard

Types
Solve
Consider the following TypeScript code: 
 image
Which of the following statements are correct:
            
            A: The typescript compiler confirms that toUpperCase exists on the a instance.
            B: The typescript compiler states that the toUpperCase function does not exist on the b instance.
            C: The typescript compiler confirms that the toUpperCase function exists on the b instance.
            D: RectangleType is an array where the type of a fixed number of elements is known.
            E: Variables r, g, b are immutable.
            F: r, g, b would compile to same type signature
🧐 Question🔧 Skill

Medium

Alias
OOPs

2 mins

TypeScript
Solve

Medium

Truthiness
Narrowing

3 mins

TypeScript
Solve

Hard

Types

2 mins

TypeScript
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Alias
OOPs
TypeScript
Medium2 mins
Solve
Truthiness
Narrowing
TypeScript
Medium3 mins
Solve
Types
TypeScript
Hard2 mins
Solve

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