Array length property in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the length of the array.

Javascript

const fruits = ['apple', 'banana', 'cherry'];
console.log(fruits.[1]);

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Alength

Bsize

Ccount

Dtotal

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'size' instead of 'length'.

Trying to call length as a function like length().

The length property returns the number of elements in an array.

2fill in blank

medium

Complete the code to check if the array is empty.

Javascript

const numbers = [];
if (numbers.[1] === 0) {
  console.log('Array is empty');
}

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Asize

Btotal

Clength

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'size' or 'count' which are not valid array properties.

Forgetting to compare length to 0.

Checking if length is 0 tells us if the array has no elements.

3fill in blank

hard

Fix the error in accessing the array length.

Javascript

const colors = ['red', 'green', 'blue'];
console.log(colors.[1]());

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Atotal

Bsize

Ccount

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses after length causing a TypeError.

Using incorrect property names like size or count.

length is a property, not a function, so it should not have parentheses.

4fill in blank

hard

Fill both blanks to create an array of numbers and print its length.

Javascript

const numbers = new Array([1]);
console.log(numbers.[2]);

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A5

Blength

Csize

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'size' instead of 'length' for the property.

Using a string instead of a number for the array size.

new Array(5) creates an array with length 5, and length property gives the size.

5fill in blank

hard

Fill all three blanks to create an array, add an element, and print the new length.

Javascript

const arr = [];
arr.[1]('hello');
console.log(arr.[2] + [3]);

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Apush

Blength

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names like 'add' instead of 'push'.

Trying to call length as a function.

Adding 0 instead of 1 to length.

push adds an element, length gives current size, adding 1 gives the new length after adding the element.