How to convert letters to numbers with Javascript?

Sunday, May 19, 2024

97

How to convert letters to numbers with Javascript?

rated 0 times [ 99] [ 2] / answers: 1 / hits: 165122 / 10 Years ago, tue, march 25, 2014, 12:00:00

How could I convert a letter to its corresponding number in JavaScript?

For example:

a = 0

b = 1

c = 2

d = 3

I found this question on converting numbers to letters beyond the 26 character alphabet, but it is asking for the opposite.

Is there a way to do this without a huge array?

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Answers

5

You can get a codepoint* from any index in a string using String.prototype.charCodeAt. If your string is a single character, you’ll want index 0, and the code for a is 97 (easily obtained from JavaScript as 'a'.charCodeAt(0)), so you can just do:

s.charCodeAt(0) - 97

And in case you wanted to go the other way around, String.fromCharCode takes Unicode codepoints* and returns a string.

String.fromCharCode(97 + n)

[#71797] Sunday, March 23, 2014, 10 Years [reply] [flag answer]

answered 10 Years ago

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