LetterNumber

A letter's 1-based position in the English alphabet -- a → 1, …, z → 26.

✓ checked against that system · ! checked, with disagreements (hover a chip)Wolfram LanguageLetterNumber✓↗

LetterNumber(c)the 1-based alphabet position of a single character c (0 if not a letter)

LetterNumber(s)a list, one position per character of string s

Typed signatures

Type	Package	Applies
(string, string?) -> integer | list<integer>	combinatorics	always

Domain: Collections

Details

• Case-insensitive -- LetterNumber("D") and LetterNumber("d") agree.
• The LetterNumber(c, alphabet) form is only answered for alphabet = "English"; any other named alphabet is left unevaluated.

Examples

Basic #

live ↗

In$\mathrm{LetterNumber}(\text{d})$Out$4$

Position of a letter in the alphabet

live ↗

In$\mathrm{LetterNumber}(\text{D})$Out$4$

Scope #

A string gives one position per character

live ↗

In$\mathrm{LetterNumber}(\text{cab})$Out$\bigl\lbrack3, 1, 2\bigr\rbrack$

Properties #

Case does not matter

live ↗

In$\mathrm{LetterNumber}(\text{c})$Out$3$

About

Examples	4
Checked against	Wolfram Language 4 agree
Crosswalk	Wolfram Language