The Assignment Operator Mockest | JavaScript

11.

How to use destructuring to extract properties from an object?

A). { a, b } = { a: 1, b: 2 } B). let { a, b } = { a: 1, b: 2 }; C). let a, b = { a: 1, b: 2 }; D). let (a, b) = { a: 1, b: 2 };

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12.

What will be the result of let { a, b } = { a: 3, b: 4 };?

A). a is 4, b is 3 B). a is 3, b is 4 C). a is undefined, b is undefined D). a is null, b is null

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13.

Which of these correctly assigns values to variables using array destructuring?

A). [x, y, z] = [1, 2, 3] B). [1, 2, 3] = [x, y, z] C). let [x y z] = [1 2 3]; D). (x, y, z) = [1, 2, 3];

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14.

What does const do in JavaScript?

A). Declares a block-scoped variable B). Declares a constant value C). Declares a global variable D). Declares a function

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15.

Can a constant objects properties be changed?

A). Yes B). No C). Only if redeclared D). Only with special methods

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16.

What will const x = { a: 1 }; x.a = 2; do?

A). Throw an error B). Change x.a to 2 C). Change x to 2 D). Do nothing

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17.

Which assignment will fail?

A). const x = 10; x = 20; B). let y = 5; y = 10; C). var z = 15; z = 30; D). let a = { b: 2 }; a.b = 3;

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18.

How do you assign default values in destructuring?

A). let { a, b } = { a: 1 }; B). let { a = 1, b = 2 } = {}; C). let [a, b] = [1, 2]; D). let { a, b } = { a: 1, b: 2 };

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19.

What does let { a: alpha, b: beta } = { a: 1, b: 2 }; do?

A). Creates variables alpha and beta with values 1 and 2 B). Creates variables a and b with values 1 and 2 C). Throws an error D). Assigns default values

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20.

What will be the output of let { a, b } = { a: 1, b: 2, c: 3 };?

A). a is 1, b is 2 B). a is 2, b is 3 C). a is 1, b is undefined D). a is 3, b is undefined

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