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| /** | |
| * A set of static methods governing string-to-int conversion | |
| * in base26. In base26, only lowercase alpha chars [a-z] | |
| * are valid and map to an integer range (0, 26] | |
| */ | |
| module.exports = { | |
| /** | |
| * returns the base26 integer corresponding with the provided char. Note | |
| * that by design uppercase chars may be supplied, and are | |
| * treated as lowercase. If a string containing more than one char is | |
| * supplied, only the first char (0 index) is considered. | |
| * | |
| * @param {string} char | |
| * @returns {number} (0, 26] | |
| */ | |
| getBase26Digit: (char) => { | |
| let normalized = char.toLowerCase().charCodeAt(0) - 97 | |
| if (normalized <= 25 && normalized >= 0) { return normalized } | |
| else { throw new Error('not base 26') } | |
| }, | |
| /** | |
| * returns a lowercase alpha char [a-z] corresponding with the provided integer. | |
| * If the provided integer is outside the range of (0, 26], an error will be thrown. | |
| * | |
| * @param {number} digit - a number in the range (0, 26] | |
| * @throws will throw an error if the digit param is outside (0, 26] | |
| * @returns {string} [a-z] | |
| */ | |
| getUTF16: (digit) => { | |
| if (digit < 0 || digit > 25) { throw new Error('not base 26') } | |
| return String.fromCharCode(digit + 97) | |
| } | |
| } |
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