Using the bracket notacion to find the Last Character in a String

JavaScript
1

Tell us what’s happening:

Your code so far


// Example
var firstName = "Ada";
var lastLetterOfFirstName = firstName[firstName.length - 1];

// Setup
var lastName = "Lovelace";

// Only change code below this line.
var lastLetterOfLastName = lastName[lastName.length - 7];

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Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-last-character-in-a-string

2

In your code lastName[lastName.length - 7] you are returning second character instead of last.

lastName = “Lovelace”
L o v e l a c e
1 2 3 4 5 6 7 8

To get the last character fo the lastName you need to do the following:

  1. Find out what the length of the lastName is: this is done with .length property on the string
    in this case, its lastName.length would give you a length of 8.

  2. Next, you need to get the index of the last character which is done by doing the following
    lastName.length - 1 , reason for subtracting 1 is because string index starts from 0 not 1.
    So even though length returns 8 the actual position of the last element in the string is 8 -1

actual string index positions
L o v e l a c e
0 1 2 3 4 5 6 7

  1. Lastly, get the last character from the string by using [] oprator on the staring
    lastName[lastName.length - 1] ;
    which equals to following
    lastName[8-1];