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// the minimum number of operations required to convert string a to string b.
function minDistance(a: string, b: string, threshold: number): number {
const m = a.length
const n = b.length
if (m < n) {
return minDistance(b, a, threshold)
}
if (n === 0) {
return m
}
let previousRow = Array.from({ length: n + 1 }, (_, i) => i)
for (let i = 0; i < m; i++) {
const s1 = a[i]
let currentRow = [i + 1]
for (let j = 0; j < n; j++) {
const s2 = b[j]
const insertions = previousRow[j + 1] + 1
const deletions = currentRow[j] + 1
const substitutions = previousRow[j] + Number(s1 !== s2)
currentRow.push(Math.min(insertions, deletions, substitutions))
}
previousRow = currentRow
}
return previousRow[previousRow.length - 1]
}
export function detectTypo(input: string, options: string[], threshold = 2) {
const potentialTypos = options
.map((o) => ({
option: o,
distance: minDistance(o, input, threshold),
}))
.filter(({ distance }) => distance <= threshold && distance > 0)
.sort((a, b) => a.distance - b.distance)
if (potentialTypos.length) {
return potentialTypos[0].option
}
return null
}
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