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levenshtein.js
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34 lines (30 loc) · 793 Bytes
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function levenshteinDistance(a, b) {
const matrix = [];
// Increment along the first column of each row
let i;
for (i = 0; i <= b.length; i++) {
matrix[i] = [i];
}
// Increment each column in the first row
let j;
for (j = 0; j <= a.length; j++) {
matrix[0][j] = j;
}
// Fill in the rest of the matrix
for (i = 1; i <= b.length; i++) {
for (j = 1; j <= a.length; j++) {
if (b.charAt(i - 1) === a.charAt(j - 1)) {
matrix[i][j] = matrix[i - 1][j - 1];
} else {
matrix[i][j] = Math.min(
matrix[i - 1][j - 1] + 1, // substitution
Math.min(
matrix[i][j - 1] + 1, // insertion
matrix[i - 1][j] + 1
)
); // deletion
}
}
}
return matrix[b.length][a.length];
}