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29 lines
683 B
29 lines
683 B
/**
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* @author Titus Wormer
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* @copyright 2016 Titus Wormer
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* @license MIT
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* @module is-alphabetical
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* @fileoverview Check if a character is alphabetical.
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*/
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'use strict';
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/* eslint-env commonjs */
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/* Expose. */
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module.exports = alphabetical;
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/**
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* Check whether the given character code, or the character
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* code at the first character, is alphabetical.
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*
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* @param {string|number} character
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* @return {boolean} - Whether `character` is alphabetical.
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*/
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function alphabetical(character) {
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var code = typeof character === 'string' ?
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character.charCodeAt(0) : character;
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return (code >= 97 && code <= 122) || /* a-z */
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(code >= 65 && code <= 90); /* A-Z */
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}
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