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35 lines
1.1 KiB
JavaScript
35 lines
1.1 KiB
JavaScript
// Compute the edit distance between the two given strings
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function getEditDistance(sourceString, targetString) {
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if (sourceString.length === 0) return targetString.length;
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if (targetString.length === 0) return sourceString.length;
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let matrix = [];
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// increment along the first column of each row
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for (let i = 0; i <= targetString.length; i++) {
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matrix[i] = [i];
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}
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// increment each column in the first row
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for (let j = 0; j <= sourceString.length; j++) {
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matrix[0][j] = j;
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}
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// Fill in the rest of the matrix
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for (let i = 1; i <= targetString.length; i++) {
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for (let j = 1; j <= sourceString.length; j++) {
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let cost = 1;
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if (targetString.charAt(i-1) === sourceString.charAt(j-1)) {
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cost = 0;
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}
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matrix[i][j] = Math.min(matrix[i-1][j-1] + cost, // substitution
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matrix[i][j-1] + 1, // insertion
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matrix[i-1][j] + 1 // deletion
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);
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}
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}
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return matrix[targetString.length][sourceString.length];
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}
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//console.log(getEditDistance("saturday", "sunday")); //sollte 3 ergeben
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