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даю подсказку: flatMap - хорошая тема
Size: a a a
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function f(str){держи микрочел
let [z,x,...c] = str.split(/_|,/)
return [...Array.from({length:x-z+1}, (_,k)=>+k+ +z), ...c.map(Number)]
}
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const range = (start, end = start) => Array.from(Array(end - start + 1), (_, i) => i + start);
на, зануда. теперь с тебя точно та хрень ><IS