Multiple choice javascript

Which of the following JavaScript statements use arrays?

  1. setTimeout("a["+i+"]",1000)

  2. k = a & i

  3. k = a(i)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Option A demonstrates array syntax using bracket notation a[i] within setTimeout. Options B and C use incorrect syntax - the & operator is bitwise AND, not array access, and a(i) uses function call syntax instead of array indexing. Only option A properly uses JavaScript array notation.

AI explanation

To answer this question, you need to understand how arrays are used in JavaScript.

An array is a special type of variable that can store multiple values in a single variable. It is created using square brackets [] and each value is separated by a comma.

Let's go through each option to understand which one uses arrays:

Option A) setTimeout("a["+i+"]",1000) - This option uses an array. The a variable is likely an array, and it is accessing the element at the index i using square brackets.

Option B) k = a & i - This option does not use arrays. It is using the bitwise AND operator (&) to perform a bitwise operation between variables a and i.

Option C) k = a(i) - This option does not use arrays. It is using parentheses () to call a function named a with the parameter i.

The correct answer is option A. This option uses an array to access an element at a specific index.

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