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tests: Levenshtein Distance (dynamic programming solution) (#1114)

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`@@ -91,7 +91,7 @@ npm test`
`91`	`91`	`If you want save some time and just run a specific test:`
`92`	`92`
`93`	`93`	```shell
`94`		`-# this will run any test file where the filename matches "koch"`
	`94`	`+# This will run any test file where the filename contains "koch" (no need to specify folder path)`
`95`	`95`	`npm test -- koch`
`96`	`96`	```
`97`	`97`

Lines changed: 8 additions & 4 deletions

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`@@ -1,6 +1,10 @@`
`1`	`1`	`/**`
`2`		`- * A Dynamic Programming based solution for calculation of the Levenshtein Distance`
`3`		`- * https://en.wikipedia.org/wiki/Levenshtein_distance`
	`2`	`+ * @function calculateLevenshteinDp`
	`3`	`+ * @description A Dynamic Programming based solution for calculation of the Levenshtein Distance.`
	`4`	`+ * @param {String} x - Word to be converted.`
	`5`	`+ * @param {String} y - Desired result after operations.`
	`6`	`+ * @return {Integer} The Levenshtein distance between x and y.`
	`7`	`+ * @see [Levenshtein_distance](https://en.wikipedia.org/wiki/Levenshtein_distance)`
`4`	`8`	`*/`
`5`	`9`
`6`	`10`	`function minimum (a, b, c) {`
`@@ -18,7 +22,7 @@ function costOfSubstitution (x, y) {`
`18`	`22`	`}`
`19`	`23`
`20`	`24`	`// Levenshtein distance between x and y`
`21`		`-function calculate (x, y) {`
	`25`	`+function calculateLevenshteinDp (x, y) {`
`22`	`26`	`const dp = new Array(x.length + 1)`
`23`	`27`	`for (let i = 0; i < x.length + 1; i++) {`
`24`	`28`	`dp[i] = new Array(y.length + 1)`
`@@ -39,4 +43,4 @@ function calculate (x, y) {`
`39`	`43`	`return dp[x.length][y.length]`
`40`	`44`	`}`
`41`	`45`
`42`		`-export { calculate }`
	`46`	`+export { calculateLevenshteinDp }`

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`@@ -0,0 +1,19 @@`
	`1`	`+import { calculateLevenshteinDp } from '../LevenshteinDistance'`
	`2`	`+`
	`3`	`+test('Should return the distance counting additions and removals', () => {`
	`4`	`+ const from = 'kitten'`
	`5`	`+ const to = 'sitting'`
	`6`	`+ expect(calculateLevenshteinDp(from, to)).toBe(3)`
	`7`	`+})`
	`8`	`+`
	`9`	`+test('Should return the distance based on replacements in the middle of the strings', () => {`
	`10`	`+ const from = 'book'`
	`11`	`+ const to = 'back'`
	`12`	`+ expect(calculateLevenshteinDp(from, to)).toBe(2)`
	`13`	`+})`
	`14`	`+`
	`15`	`+test('Should return the distance for strings with different length', () => {`
	`16`	`+ const from = 'sunday'`
	`17`	`+ const to = 'saturday'`
	`18`	`+ expect(calculateLevenshteinDp(from, to)).toBe(3)`
	`19`	`+})`

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