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kurone-kito/groupByPrefix.ts

Last active June 19, 2019 01:55
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Group duplicate prefixes in the strings: (src: string[]) => string[]
Raw
groupByPrefix.ts
const getInitials = (src: string[], length = 1) =>
Array.from(new Set(src.map(v => v.substring(0, length))));
export default (src: string[]) =>
getInitials(src).map(initial => {
const list = src.filter(v => v.match(`^${initial}`));
const rec = (prev: string, length = 2): string => {
const [word, ...{ length: l }] = getInitials(list, length);
return l || list[0].length < length ? prev : rec(word, length + 1);
};
return rec(initial);
});
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