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define regex once
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source/to-decimal.ts
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source/to-decimal.ts
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return letter.codePointAt(0)! - 'A'.codePointAt(0)! + 1;
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}
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const allowedStringPattern = /^[A-Z]+$/v;
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/**
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* Converts a bijective base-26 string to a decimal number.
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*
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* @param string
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*/
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export default function toDecimal(string: string): number {
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if (typeof string !== 'string' || !/^[A-Z]+$/v.test(string)) {
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if (typeof string !== 'string' || !allowedStringPattern.test(string)) {
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throw new TypeError(
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`Expected string to only contain upper-case letters, got \`${string}\``,
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);