36 lines
1.0 KiB
JavaScript
36 lines
1.0 KiB
JavaScript
const { startsWithVowel } = require('../helpers');
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const ACRONYM = /^[A-Z]+$/;
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const IRREGULAR_ACRONYM = /^[UFHLMNRSX]/;
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const isIrregularAcronym = word => IRREGULAR_ACRONYM.test(word.charAt(0));
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/**
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* Both = a && b
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* Neither = !a && !b
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* In the case of Booleans, this means
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* either both true or both false, so
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* we can just compare the equality of
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* a and b.
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*/
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const bothOrNeither = (a, b) => a === b;
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/**
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* If the entirety of the first word is capital letters
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* and case insensitivity is off, it's an acronym.
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*/
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exports.check = (word, { caseInsensitive }) => caseInsensitive ? false : ACRONYM.test(word.split(' ')[0]);
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exports.run = (word) => {
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let isIrregular = isIrregularAcronym(word);
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let initialVowel = startsWithVowel(word);
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/*
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* If it starts with U: "a"
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* If it starts with any other vowel: "an"
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* If it starts with F, H, L, M, N, R, S, or X: "an"
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* If it starts with any other consonant: "a"
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*/
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let article = bothOrNeither(initialVowel, isIrregular) ? 'a' : 'an';
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return article;
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};
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