Understanding Arrays in Programming

What is an array in programming?

• A function that performs calculations on numbers

• An array is a data structure that holds a collection of elements, typically of the same type, accessible by index.

• A type of variable that can hold only one value

• A method for sorting data in a list

How do you declare an array in JavaScript?

• let myArray = [];

• var myArray = new Array();

• let myArray = () => {};

• const myArray = {};

What is the difference between a one-dimensional and a multi-dimensional array?

• A one-dimensional array can only store numbers, while a multi-dimensional array can store any data type.

• A one-dimensional array has a single index for access, while a multi-dimensional array uses multiple indices.

• A one-dimensional array is always larger than a multi-dimensional array.

• A one-dimensional array can only be used in programming languages, while a multi-dimensional array can be used in spreadsheets.

How can you access the first element of an array?

• Use array[0] to access the first element of an array.

• Use array.get(0) to access the first element of an array.

• Use array.first() to access the first element of an array.

• Use array[1] to access the first element of an array.

What method would you use to add an element to the end of an array in Python?

• Use the append() method.

• Use the extend() method.

• Use the add() method.

• Use the insert() method.

Explain how to iterate over an array using a for loop.

• for (i = 0; i < array.length; i++) { print(array[i]); }

• for (let i in array) { console.log(array[i]); }

• for (let i = 1; i <= array.length; i++) { console.log(array[i]); }

• for (let i = 0; i < array.length; i++) { console.log(array[i]); }

What is the purpose of the 'length' property in an array?

• The 'length' property is used to sort the elements in an array.

• The 'length' property defines the maximum size of an array.

• The 'length' property stores the last element of the array.

• The 'length' property indicates the number of elements in an array.

How do you remove an element from an array in Java?

• Set the element to null to remove it from the array.

• Use ArrayList to remove an element from an array in Java.

• Use the remove() method directly on the array.

• Use a for loop to delete an element from an array.

What is the output of accessing an index that is out of bounds in an array?

• The array returns a default value.

• The index is automatically adjusted to the nearest valid index.

• An error or exception is raised.

• The program continues without any issues.

Can arrays hold different data types? Provide an example.

• Example: [true, false, null]

• Yes, arrays can hold different data types. Example: [1, 'two', {key: 'value'}]

• No, arrays can only hold one data type.

• Arrays can only hold numeric values.