Constant Objects can Change Mockest | JavaScript

11.

Which statement is true about constant objects in JavaScript?

A). The properties of a constant object cannot be changed B). Constant objects are frozen and immutable C). Constant objects cannot have properties added or deleted D). The object reference can be reassigned

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12.

What is the output of the following code snippet?

A). { a: 1, b: 2, c: 3 } B). { a: 1, b: 2 } C). { c: 3 } D). Error

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13.

Which of the following is a valid way to define a constant object in JavaScript?

A). const obj = { a: 1, b: 2 }; B). const obj = new Object({ a: 1, b: 2 }); C). Both A and B D). None of the above

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14.

What happens if you use Object.freeze() on a constant object in JavaScript?

A). The object reference becomes mutable B). The properties of the object become immutable C). The object becomes frozen and cannot be modified D). A TypeError is thrown

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15.

How can you ensure that a constant object remains unchanged in JavaScript?

A). Use Object.preventExtensions() B). Use Object.freeze() to freeze the object C). Use const for each property D). All of the above

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16.

What is the data type of a constant object in JavaScript?

A). Object B). Array C). Function D). String

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17.

What happens if you try to modify a property of a frozen object in JavaScript using Object.freeze()?

A). The property is modified successfully B). A TypeError is thrown C). The property is deleted D). The object becomes mutable

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18.

How can you check if an object is frozen in JavaScript?

A). Using the frozen property B). Using the isFrozen() method C). Using the Object.isFrozen() method D). All of the above

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19.

Which statement about constant objects in JavaScript is correct?

A). Constant objects can have their properties reassigned B). Constant objects cannot have properties added or removed C). Constant objects are only applicable to primitive values D). Constant objects are mutable

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20.

What happens if you try to delete a property from a constant object in JavaScript?

A). The property is deleted successfully B). A TypeError is thrown C). A SyntaxError is thrown D). Nothing happens

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