#bracket notation

[alanacodes]

Use Bracket Notation to Find the Nth-to-Last Character in a String

You can use the same principle we just used to retrieve the last character in a string to retrieve the Nth-to-last character.

For example, you can get the value of the third-to-last letter of the var firstName = “Charles” string by using firstName[firstName.length - 3].

Example:

var firstName = “Charles”;

var thirdToLastLetter = firstName[firstName.length - 3];

thirdToLastLetter would have a value of the string 1.

[alanacodes]

Use Bracket Notation to Find the Last Character in a String

In order to get the last letter of a string, you can subtract one from the string’s length.

For example, if var firstName = “Charles”, you can get the value of the last letter of the string by using firstName[firstName.length - 1].

Example:

var firstName = “Charles”;

var lastLetter = firstName[firstName.length - 1];

lastLetter would have a value of the string s.

[alanacodes]

Use Bracket Notation to Find the Nth Character in a String

You can also use bracket notation to get the character at other positions within a string. 

Remember that computers start counting at 0, so the first character is actually the zeroth character.

Example:

var firstName = “Ada”;

var secondLetterOfFirstName = firstName[1];

secondLetterOfFirstName would have a value of the string d.

[alanacodes]

Use Bracket Notation to Find the First Character in a String

Bracket notation is a way to get a character at a specific index within a string.

Most modern programming languages, like JavaScript, don’t start counting at 1 like humans do. They start at 0. This is referred to as Zero-basing indexing.

For example, the character at index 0 in the word Charles is C. So if var firstName = “Charles”, you can get the value of the first letter of the string by using firstName[0].

Example:

var firstName = “Charles”;

var firstLetter = firstName[0];

firstLetter would have a value of the string C.