A developer is building a module that needs a helper function to format a price. The function is only used inside the module and should not be accessible outside it. The developer also wants to ensure the function is defined before any code that might call it, even if the call appears earlier in the file. Which approach satisfies both requirements?

var formatPrice = (amount) => { return '$' + amount.toFixed(2); };

function formatPrice(amount) { return '$' + amount.toFixed(2); }

const formatPrice = (amount) => { return '$' + amount.toFixed(2); };

const formatPrice = function(amount) { return '$' + amount.toFixed(2); };

A developer is refactoring a function that uses the this keyword to access an object's property. The function is currently a regular function expression. The developer wants to convert it to an arrow function. What is the key difference they must account for?

Arrow functions cannot take parameters, so the signature must change.

Arrow functions are hoisted, so they can be called before their definition.

Arrow functions always return the first expression, so the return keyword is required.

Arrow functions do not have their own this; they inherit it from the enclosing scope.

LPI Web Development Essentials

Domain 4Objective 3

034.3 JavaScript Control Structures and Functions (weight: 4) WEB-DEVELOPMENT-ESSENTIALS Practice Questions (Page 3)

Part of the 034 JavaScript Programming domain, which makes up ~16% of our current practice bank. Linux Professional Institute does not publish an official question count, but from its 60-minute exam (~25–40 total, ~4–6 in this domain), expect 1–2 from this objective — we provide 22 practice questions to prepare you well beyond it. (estimate)

22questions here

5free pages

13concepts

Questions 11–15

11foundation · easy
What is the result of the expression 0 == "0"?
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12foundation · easy
Which expression evaluates to false?
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13application · medium
A developer is building a module that needs a helper function to format a price. The function is only used inside the module and should not be accessible outside it. The developer also wants to ensure the function is defined before any code that might call it, even if the call appears earlier in the file. Which approach satisfies both requirements?
Select an answer first
14application · medium
A developer is refactoring a function that uses the this keyword to access an object's property. The function is currently a regular function expression. The developer wants to convert it to an arrow function. What is the key difference they must account for?
Select an answer first
15foundation · easy
What is the result of the following expression? let age = 20; let status = age >= 18 ? "adult" : "minor";
Select an answer first

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034.3 JavaScript Control Structures and Functions (weight: 4) WEB-DEVELOPMENT-ESSENTIALS Practice Questions (Page 3)

Questions 11–15

What is the result of the expression 0 == "0"?

Which expression evaluates to false?

A developer is refactoring a function that uses the this keyword to access an object's property. The function is currently a regular function expression. The developer wants to convert it to an arrow function. What is the key difference they must account for?

What is the result of the following expression? let age = 20; let status = age >= 18 ? "adult" : "minor";

Keep studying — 034 JavaScript Programming