One line JS generate all possible neighbor number for any position.
const allNumberNeighbor = number => [...number] .map(Number) .flatMap((n, i) => Number(n) && [ n + 1 <= 9 && Object.values({ ...number, [i]: n + 1 }), n - 1 >= 0 && Object.values({ ...number, [i]: n - 1 }), ]) .filter(Boolean) .map(n => n.join('')); allNumberNeighbor('555-555-555'); // return /* [ '655-555-555', '455-555-555', '565-555-555', '545-555-555', '556-555-555', '554-555-555', '555-655-555', '555-455-555', '555-565-555', '555-545-555', '555-556-555', '555-554-555', '555-555-655', '555-555-455', '555-555-565', '555-555-545', '555-555-556', '555-555-554', ]; */
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One line JS generate all possible neighbor number for any position.