FAQ: Data Structures - Access by Index

Frequently Asked Questions Ruby FAQ
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This community-built FAQ covers the “Access by Index” exercise from the lesson “Data Structures”.

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This exercise can be found in the following Codecademy content:

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FAQs on the exercise Access by Index

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2

I’m a little confused with the instructions, please explain!

1.

Use square bracket notation to print the third value of demo_array to the console.

Remember that the third value is at index 2 , not at index 3 . We start counting indices from zero.

demo_array = [100, 200, 300, 400, 500]

print demo_array [2] <------ my result

3

Your result is valid, but the SCT may not expect the space.

2 Likes
4

Your code should print: 300
The demo_array contains 5 elements or values. Arrays allow us to access each element by its index or address if you’d like to think of it that way. The value at index 0 is 100. The value at index 4 is 500. We access the values at each index by using the name of the array followed by the index inside of square brackets like so: demo_array[2]. Hope this helps!

5

Thank you so much! now i understand

1 Like
6

The SCT will say your code is incorrect if you have a space between the name of the array and the Index number.

demo_array [2] 300 is printed. wrong!

demo_array[2] 300 is printed. correct!

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